What was the reason for Washington crossing the Delaware River in winter? To capture the key city of Princeton.
To gather troops from the neighboring areas.
To defeat the opposing army from an unprotected front.
To open the west for a Canadian route to overtake the enemy.

I'm pretty sure it is to defeat the opposing army from an unprotected front.

Explanation:

napoleon the third became a empire in 1873 also known as the era of the franco-prussian war.

bloodiest single day of war   |   gettysburg

where the civil war ends for good   | appomattox court house

the first major land battle; south wins | bull run/manassas (va)

gives union control of the mississippi river |   vicksburg

lee’s first tactical defeat; big win for union |   fort sumter1

with lincoln's re-election |   atlanta

south wins

splits confederacy in two for the duration of the war,

antietam