20 battles won thanks to the weather

Hannibal’s ambush succeeded because the Romans marched into it blindly, with thick fog shrouding the lake and the surrounding countryside. When the trap closed in, the Romans’ usual strengths—their discipline and training—mattered less amid the confusion and poor visibility.

The Roman column in the Teutoburg Forest was routed on already hostile terrain, and the dreadful weather only made matters worse. The wet ground and difficult conditions made movement arduous, which played a significant role in a battle characterized by ambushes, the splitting of the column, and the panic that spread along the line.

At Hattin, the heat and thirst were not mere details; they were part of the arsenal. Cutting off access to water and forcing an army to march and fight while dehydrated helped tip the scales, because exhaustion does not politely wait for tactics to catch up. 

The field of Agincourt was a strip of freshly plowed earth, bordered by woods, and the rain from the previous night had turned that churned soil into a muddy quagmire that swallowed up the ankles—exactly the kind of terrain that punishes men clad in metal. As the French advance compressed into a narrow front, the knights and men-at-arms had to trudge painfully through the increasingly deep mud while arrows continued to rain down, and those who fell could not easily get back to their feet, weighed down by their armor.

Towton reminds us that the wind is not a neutral factor when thousands of arrows are in the air. A strong wind helped the Yorkist archers outrange their opponents, and the swirling snow made it harder to judge return shots—the kind of advantage that arises quickly and snowballs. 

The defeat of the Armada is inextricably linked to the weather conditions that battered the ships as they attempted to return home by sailing around Scotland and Ireland. Contemporary records used by the National Archives highlight the persistence of the adverse conditions and the fact that only part of the fleet managed to return, marking a crushing defeat following the battles. 

In Narva, a snowstorm hit the Russians head-on, and the Swedes attacked under cover of the storm before the Russians could properly position their artillery. This is the kind of timing that seems daring in a history book but makes perfect sense when you imagine trying to aim, load, and coordinate your efforts in a snowstorm. 

The crossing before Trenton took place under difficult winter conditions, with ice and bad weather making every step of the night’s journey more challenging. The reward was a surprise, as such miserable conditions might lead the defenders to believe that no one would be reckless enough to attempt the journey.

At Red Cliffs, the fire attack depended on a very specific shift in the wind, as the plan would only work if the flames and smoke moved in the right direction over the water. The attackers sent ships loaded with fuel toward Cao Cao’s fleet, and the wind drove the burning ships toward the tightly moored vessels, allowing the fire to spread rapidly from one hull to another while the smoke reduced visibility and hindered coordination.

At Austerlitz, the morning fog was not only spectacular; it actively distorted the battlefield, concealing movements in the lowlands and making it more difficult to discern Napoleon’s intentions. The Allied commanders believed that the French right flank was weak and in retreat, and the fog helped reinforce this impression as their columns left the Pratzen Heights to pursue what they thought was the main opportunity. 

At the Berezina, in late November 1812, the weather turned so bad that it ruined all obvious options. The thaw broke up the ice, preventing the army from crossing the river, but it also turned the surrounding area into mud and slush, so that men, horses, and wagons became bogged down while trying to reach the crossing points.

At Waterloo, heavy overnight rains had left the clay fields so waterlogged that Napoleon delayed the initial attack, as the infantry—and especially the artillery—could not move or fire as effectively on that type of terrain. The cannons sank into the ground, the wheels spun, and the cannonballs—which might otherwise have ricocheted and torn through the ranks—sank into the ground, lessening the impact of the bombardment.

During the Second Battle of the Masurian Lakes in February 1915, winter conditions were not merely a backdrop; they constituted the operational environment. Heavy snowfall and repeated storms reduced visibility and made travel difficult, while deep snowdrifts turned roads and trails into bottlenecks where columns slowed down and units lost contact with one another. 

In Amiens, on August 8, 1918, a thick morning fog blanketed the battlefield, allowing Allied forces to assemble and advance with far less caution than usual. Tanks and infantry were able to close the distance before German observers and machine-gun crews had a clear view, and the first signs of their presence often came in the form of noises and silhouettes rather than targets that could be calmly aimed at and hit.

During the Battle of Moscow in late 1941, the cold set in just as German forces were already at the end of their rope, with strained supply lines and winter gear that was either incomplete or delayed. As temperatures plummeted, cases of frostbite multiplied, and weapons, vehicles, and lubricants began to fail, turning routine movements into a daily struggle—especially as snow and frozen ground made towing, repairs, and basic maintenance more difficult.

During the final stages of the Battle of Stalingrad, the winter cold became a daily force multiplier against men who were already exhausted, undernourished, and lacking adequate shelter. Sub-zero temperatures and biting winds caused frostbite and hypothermia, and also made even the simplest tasks more difficult: digging into frozen ground, carrying ammunition with numb hands, keeping weapons in working order, and moving the wounded without letting them freeze on the way to medical aid.  

At the Chosin Reservoir in late 1950, the cold was not merely unpleasant; it was operationally decisive, with temperatures plummeting well below zero and a wind that turned exposed skin into a liability within minutes. Weapons jammed, batteries died, and vehicles became stubborn problems that had to be coaxed into motion, while the wounded faced the added danger of freezing during their evacuation.

During Operation Market Garden in September 1944, the plan relied heavily on the timing of the airborne operations, but the weather continually disrupted the schedule. Low clouds, fog, and rain over England and the drop zones repeatedly delayed the transport flights, scattered some formations, and made it more difficult to rapidly establish sufficient ground combat power to keep the corridor intact. 

At the start of the Battle of the Ardennes, low clouds, fog, and winter storms neutralized much of the Allies’ tactical air superiority, which had generally hampered German movements during the day. This weather cover allowed German columns to cross the Ardennes with far less immediate interference from fighter-bombers, buying time for the offensive to gain momentum.

The landing took place at that time because forecasters and commanders were watching for a narrow weather window, and the Met Office explains how that decision depended on changing weather conditions. The story isn’t romantic; it’s pragmatic: the waves, cloud cover, and timing were so critical that weather forecasts became a key part of the invasion plan.