Paul Revere's Ride. In lines 97-100 the “bloody work” the windows” would look upon” is

It means the battle that will happen the next day near the building.

Explanation:

Paul Revere's ride is a poem written by an American poet Henry wadworth Longfellow in 1890. It was written to show respect to American Patriots and to warn American rebels of approaching British troops. It is important because the warning given help them to fight British army who launched initial attack.

In lines 97-100 the “bloody work” the windows” would look upon means the battle that will happen the next day near the building.

b) the confederacy had to pay all union war expenses.