On the evening of February 3, 1781, American General Nathanael Greene and his troops successfully cross the Yadkin River to evade General Charles Cornwallis. The crossing followed consecutive Patriot losses at the Catawba River and at Tarrant's Tavern, as well as heavy rainfall on February 1, which Greene feared would soon make the river impassable.
Although contradictory evidence exists, it is likely that the efforts of Polish engineer and military advisor Thaddeus Kosciusko made the crossing possible. Kosciusko had made a canoe expedition up the Catawba and Pedee Rivers, assessing Greene's options, in December 1780. He then built a fleet of flat-bottomed boats for General Greene to use as a means of transporting his men across the water without having to waste time on manual portage, which would have involved soldiers removing the boats from the water and carrying them on their shoulders over land. The boats could be loaded into the Southern Army's wagons for transport between river crossings. Kosciusko's study of the rivers also allowed Greene to accurately predict the two-day interval between a heavy rainfall and rising river water.
Greene had ordered the Kosciusko-designed boats to be waiting for his men at the Yadkin. Thus, despite the flood of refugees clogging North Carolina's roads in a desperate rush to leave before notoriously cruel British Lieutenant Colonel Banastre Tarleton arrived, Greene was able to move his troops to the river and cross it. Although Cornwallis caught the tail-end of the Patriot crossing and shelled Greene's camp on the far side of the river on February 4, he was not able to cause major damage or disruption.
Greene's timing was impeccable--Cornwallis was unable to ford the quickly rising Yadkin behind him. Instead, Cornwallis was forced to march his men to the aptly named Shallow Ford and did not finish crossing the Yadkin until the morning of the February 7, by which time Greene and the Southern Army had a two-day lead in the race towards the Dan River and safety in Patriot-held Virginia.