What colony did the Continental Army take back from the British after crossing the river a final time and
pushing back the British army?

new Jersey

Explanation:

after george washington and his army crossed again it was in order to push back what was left of the british army

bbgftrtyc

the  seven  days  battles  were  a series of seven battles over seven  days from june 25 to july 1, 1862, near richmond, virginia,  during  the american civil war. the  seven  days ended with mcclellan's army in relative safety next to the james river, having suffered almost 16,000 casualtiesduring  the retreat.