Why did George Washington cross the Delaware?

Washington crossed the Delaware River so that his army could attack an isolated garrison of Hessian troops located at Trenton, New Jersey. ..

Explanation:

Washington crossed the Delaware River so that his army could attack an isolated garrison of Hessian troops located at Trenton, New Jersey. ... Washington's aim was to conduct a surprise attack upon a Hessian garrison of roughly 1,400 soldiers located in and around Trenton, New Jersey.

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.