Alma 51:30

And it came to pass that he headed Amalickiah also, as he was marching forth with his numerous army, that he might take possession of the land Bountiful, and also the land northward.

He stopped Amalickiah as he was marching with his large army. Amalickiah wanted to take over the land Bountiful and also the land to the north.

Teancum blocked Amalickiah’s advance as he marched with his massive army to take Bountiful and the lands to the north.