The tribes followed the bison's seasonal grazing and migration. The Plains Indians lived in teepees because they were easily disassembled and allowed the nomadic life of following game. When Spanish horses were obtained, the Plains tribes rapidly integrated them into their daily lives. By the early 18th century, many tribes had fully adopted a horse culture. Before their adoption of guns, the Plains Indians hunted with spears, bows, and bows and arrows, and various forms of clubs. The use of horses by the Plains Indians made hunting (and warfare) much easier.