how did white fang get away from the Indians ?

White Fang never really escapes from the Indians, but he does get away in an attempt to follow his mother.

White Fang saw his mother taken aboard Three Eagles’ canoe, and tried to follow her. A blow from Three Eagles knocked him backward to the land. The canoe shoved off. He sprang into the water and swam after it, deaf to the sharp cries of Grey Beaver to return. Even a man-animal, a god, White Fang ignored, such was the terror he was in of losing his mother. (Chapter Two)