Answer:
Two reasons:
- To take back the resources that the colonists have taken from them previously
- To weaken their army
Step-by-step explanation:
Over the course of their interaction with one another, Colonists have taken a lot of American Indian's land. This make it difficult for them to get resources for their own survival.
This is the reason why during their clashes, the often often Americans took some of the livestock that belonged to the colonists. They did it to feed their own people and to make sure that the army have less food to sustain themselves in case they're planning for a counter attack.