Why is farquhar ready to try and blow up a bridge?

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.

very positive impact on our industries in the west, sine they promoted settlement and increased the ways in which goods could be transported to market.