Why does washington need to attack before december 31st?

Washington needed to attack before December 31st because the Hessian soldiers would have become alert to face an attack from them after their Christmas and New Year celebrations were over.

It was the part of the war strategy formulated by Washington to attack the Hessian army before 31st December. This was because he wanted the Hessians to be engaged in the celebrations of Christmas and New Year which would make it easy for the American troops to defeat them.

i discarded the supernatant and kept the pellet in this part of the experiment because you have to return all unused chemicals into their original containers at the end of each labratory.

explanation:

the tariff was created to protect industry in the northern part of the united states. industries in the north were being driven out of business by imported goods that were priced at a low rate. the goal was to protect these industries   by taxing the goods.