They lost new york because they did not have enough power compared to the enemy, and were not as prepared for the attack, this caused a huge series of events happening one after another and started to spark the battle.
Getting soldiers ready for the plan
They had meetings to meet up and give each other intel on what is happening and plans what they should do to get a better understanding of what is going on and prepare each other on what could happen.
Waiting for early Christmas morning
Washington made a plan with all the intel he has gotten and created the plan and the plan was very well made and helped them a ton in winning
Took out soldiers in guard house
If the soldiers were not informed and did not understand the plan it may not of gone as smoothly then expected may have cost many lifes.
We shall attack on Christmas!
The reason why this was important is that they enemy celebrated Christmas and stayed up late so it was not expected that they would be up any time soon, although they may have not been on the time that they preferred, they were still there early in the morning and went in unexpected.
This could have been very bad if they did not succeed in doing this because the soldiers could have alerted everyone in time to where they could not have been there by surprise, that was a part of their plan to do and the best army in the world could have been ready for them when they did not expect.