Jack's boys do not attack Ralph's boys at any point in the book. Roger and Maurice accompany Jack on a night time raid on the shelters but the purpose is not 'attack' anyone but simply to steal Piggy's glasses. Even when Ralph, Samneric & Piggy go to castle rock to demand the return of Piggy's glass although they are vastly outnumbered by Jack's tribe they are not attacked.
Because they were dumb and not needed they should die :)
Jack and his boys were going to hunt, but they needed fire. The only fire found is in Ralph's area. So that's why they attacked Ralph's.
Sam'n'eric
Sam and Eric; the twins, also called Samneric in the book
They took Piggy's glasses, and fire from Ralph's camp.
As "boys with sticks."
Sam and Eric tell Jack that Ralph said he was going to hide near by so they go looking for him there.
They have spears
They do not have enough boys to keep taking turns and doing it on their own.
Ralphs was created in 1873.
By creating a set of rules. After Ralph become their leader they create a set of rules, what/where the lavatory is, building shelters, fetching food, lighting the fire (fighting for rescue). This diminishes fast though. Also Ralphs group after the boys split combs their hair back (society influence tells you to do this) to prevent themselves from looking like jacks group (a pack of savages).
Tony Ralphs was born in 1943.
Bert Ralphs was born in 1896.
Steve Ralphs was born in 1955.