Climate of Independence

Baby, It's Cold  (or Hot) Outside

This isn't about global warming (also known as climate change). This blog focuses on the weather, an often overlooked factor by some who study military history. However, serious warfare students understand that weather can often—and did often—play a crucial, if not decisive, role in military operations. 

There are many examples: Crusaders overwhelmed by intense heat in Palestine, German divisions frozen outside Moscow and Stalingrad, or Napoleon's invasion halted by an early winter. The list goes on. Perhaps the most decisive and specific instance of weather affecting warfare was the typhoon that sank the Mongol fleet preparing to invade medieval Japan—the Kamikaze, which gave its name to Japan's WWII suicide attacks.

The invading Mongol fleet destroyed by the
"Divine Wind" that saved Japan

Weather's Impact

Like any other war, especially one lasting eight years like the American War for Independence, the weather was bound to influence events. Since our First Patriots and the British didn't have a modern weather system, they had to rely on an almanac, early barometers, or local knowledge of past weather patterns. But mostly, they simply had to react to the weather as it happened. That could complicate things when unusual or unexpected weather shifts occurred. 

Year after year, across all four seasons, rebels and redcoats dealt with extremes of rain, snow, heat, and fog—as well as tides, ice formations, and winds. The weather was unpredictable, sometimes helping one side and hindering the other, and sometimes hindering both. Savvy commanders often sought to utilize the weather to their advantage or mitigate damage caused by its extremes. The weather sometimes shaped the Revolutionary War just as much as political, economic, or logistical factors.

The Heat of Battle

During the Battle of Long Island in 1776, the hot and oppressively humid weather likely played a role, which may have been one reason the long march around the Americans occurred at night. When the humidity turned into violent thunderstorms, both armies were slowed by mud and poor visibility, making the use of firelocks nearly impossible. The stormy weather and shifting tides prevented the Royal Navy from cutting off Washington's forces on Long Island. Washington used the weather to his advantage and slipped away during the stormy night. 

The early morning fog also blocked the British from seeing his retreat until it was too late. Weather, combined with decisive and heroic action, truly saved the Continental Army. The Battle of Monmouth was fought in unusually hot and humid conditions, too. This slowed the British column and gave Washington the chance to catch them as they marched across New Jersey. 

Washington's surprise attack at Germantown might have stopped Howe's plan to capture Philadelphia, but this time, the heavy morning fog confused the American attackers, and the British were warned and rallied. Later in the war, in the southern theater, hot and humid weather influenced Cornwallis's decision to abandon his shrinking army of baggage and heavy equipment, even heavy clothing, as he desperately tried to catch the clever Nathaniel Greene in the Carolinas. We know how that ended.

The Continental Army retrograde shielded by a summer storm

General Frost

Much more widely remembered are the cold campaigns: Nathaniel Greene's men dragging desperately needed cannon through the snowy mountains of New England to help win the siege of Boston. The winter at Valley Forge is iconic. 

But Washington's Christmas crossing, despite biting cold and gathering ice floes, is just as significant. The weather prevented two of his divisions from crossing, but his main column used it as cover to surprise the Hessian garrison at Trenton. The cold winter weather also caused the British to go into "winter quarters" earlier than the successes of the 1776 campaign and the nearing victory.

The weather helped with the element (sic) of surprise at Trenton

Less well known is the winter war fought in the Jerseys after Washington moved to Morristown for his winter quarters. Instead of a well-earned rest, it was the British who endured hardships as they struggled to gather supplies. The militias, and later the continentals, ambushed forage parties, attacked relief columns, and bushwhacked couriers. The British commander Lord Howe suffered casualties he could not easily replace - and gained no military advantage.

Cold Winter at Valley Force was
only one of many, and not the worst

Perhaps the campaign most affected by the cold is the least known: the 1775 invasion (liberation?) of Canada in twin attacks across America's harsh and rugged northern frontier. Colonel Benedict Arnold led several hundred men through the wilds of Maine, while General Richard Montgomery led a column through upper New York towards Montreal. The weather turned cold earlier than usual that year. Launching a northward invasion in the fall left the Americans suffering through rapidly cooling weather that plagued them all the way to Quebec. 

General Montgomery

The weather hampered both expeditions as each column battled through a mix of ice, snow, and rain. Over six inches of snow flooded Arnold's column in a single night in late October. The weather alone had severely weakened the invasion forces by the time they met near Quebec in early December. With more freezing weather approaching, Montgomery decided to attack Quebec rather than lay siege to the city. 

Hoping to use the weather to their advantage, the Americans launched an attack during a severe snowstorm. However, the blinding snow caused chaos during the assault, which ended in failure and resulted in the deaths of Montgomery and the wounding of Arnold. Arguably, two of America's best commanders were lost to General Frost.

Winter Gamble

Darkness Descends

December 1776 was truly a month that tested men's resolve. The British had been pressing the Continental Army since their invasion of Long Island in the summer. The "victory" at Harlem was the closest the struggling Americans came to stopping Lord Howe's advance. The only thing standing between Washington and an early British victory that could end the rebellion was, well, Lord Howe. His smart strategic moves, well-executed naval landings, precise tactics, and professional sieges characterized Howe's offensive. However, his slow movements allowed Washington to repeatedly slip free.

Cornwallis crossed with five thousand crack troops to begin
the rout through the Jerseys

Winter Quarters

Lord Cornwallis

 By late December, Washington's army was safe across the Delaware River and prepared to defend the nation's capital, Philadelphia. He had fewer than 2500 effective troops, and that number would soon decrease as many enlistments ended in January, with the much-needed replacements not arriving until early the next year, if at all. 

The Continental Army lacked supplies of all kinds, especially

clothing- not just winter gear, but any clothing at all! However, Washington had help from Howe, who halted General Cornwallis's 5,000 crack troops at the Delaware. Washington's men had confiscated every civilian boat for miles along the river, forcing Cornwallis to wait for the British pontoon trains before crossing. 

Meanwhile, Howe, believing Washington was defeated, ordered his army into "winter quarters," and he himself hurried back to New York to be with his mistress. Cornwallis's wife was reportedly ill, and he headed to New York to catch a ship to England before winter made crossing impossible. To guard his New Jersey holdings, Howe left brigade-sized garrisons at Princeton, Brunswick, Bordentown, and Trenton.

An Army at rest and an Army formed

General John Sullivan

As soon as he escaped Cornwallis' onslaught, Washington began to think about his next move. Congress abandoned the capital and fled to Baltimore. Congress also offered him near-dictatorial powers, which he refused. Then, the help he had counted on, and had previously dismissed, suddenly arrived. General John Sullivan, returned from British captivity, led the division of General Charles Lee across the Delaware and joined Washington near Yardley, New Jersey. 

Washington then decided to proceed with his plan; he would gamble on a surprise attack against the British garrisons closest to the Delaware: Bordentown and Trenton. Washington's bold gamble required meticulous planning, daring, and a bit of luck. His first stroke of luck was Sullivan's arrival. 

The second was his ability to persuade the troops to extend their enlistments long enough for his plan to succeed. Washington personally met with the men, and his sincerity and apparent dedication to them and the cause swayed just enough. 

The third factor was the weather, and the last was maintaining the element of surprise during a period when not only Loyalists but even discouraged patriots might betray him to the British. Spies were everywhere.

The Crossing

Washington concealed his movements from Loyalist spies and led his army to McGonkey's Ferry on the evening of December 25th. The weather was cold with snow flurries, but the river had not yet frozen over. The crossing began after dark, but one delay followed another, throwing off Washington's schedule. He planned to march about nine miles downstream and surprise the Hessian garrison commanded by Colonel Johan Rall at dawn. The critical element was the guns. Henry Knox assured him he could get all 18 cannons across. However, the snow increased in intensity, and ice floes started to form. With each wave of boats crossing in the darkness, the risk grew. Yet, Colonel John Glover's Marblehead sailors, along with the renowned Gloucester Regiment, outperformed even the heroics of Long Island. A delay in crossing would not mean crossing denial—at least at McGonkey's. Further downriver, two other divisions of Pennsylvanians, under Generals Ewing and Cadwallader, were supposed to cross and take Bordentown, as well as assist at Trenton. But the ice floes thickened to the point where neither division could cross that night. This part of Washington's plan had failed.

The Miracle

Washington's forces did not fully cross until late at night. Then, they began the night march in two columns—one along the river road and the other, which Washington joined, moving further inland. The men, cold, wet, and exhausted, struggled across rugged, rocky, and wooded terrain. With limbs frozen and nearly blind from the elements, the soldiers used patches of white paper to guide them in the dark.

 

All the time, Washington hoped the other columns could cross without being detected and that the Hessians would not be alerted and waiting. His worst fears were confirmed in the first case, but his greatest hopes came true in the second. Arriving well into the early morning light, the Americans were surprised to find the small town still asleep and the weather clearing. The sound of a cannon signaled the two-pronged attack. 

Surprised, the Hessian professionals formed up as best they could to meet the invaders, but within an hour, the battle was over. Rall, the enemy commander, was mortally wounded, and his men soon surrendered. Not a single American died, and only a few were wounded. Washington's gamble succeeded... but his winter campaign was only just beginning.

Continentals rush a Hessian gun to open the battle