What dangers did the pilgrims face upon their arrival to cape code ?

Sickness
winter
natives
short supply of food
many many more, did you passage say any of these?

As the boys sleep, military airplanes battle fiercely above the island. none of the boys sees the explosions and flashes in the clouds because the twins sam and eric, who were supposed to watch the signal fire, have fallen asleep. during the battle, a parachutist drifts down from the sky onto the island, dead.