The Americans were able to win such an overwhelming victory at Trenton because they used surprise tactics. Washington moved troops over the Delaware river at night on Christmas, and surprised the enemies in the morning!
If I remember correctly, 110,000 of them were taken from their homes and basically quarantined in detention camps because the Americans were afraid that there were spies among them and wanted to protect themselves. Hope this helps!
Indentured servants are people who were in england that didn't have the money to pay for the ship ride over to the colonies. So, these people agreed to work for a weathly person (for free) for a set amount of time in exchange for the money to buy the boat ticket.