In contrast to the neglected military capabilities of the Mexicans , authorities considered Americans as extremely aggressive in combat .
Americans were subsequently encouraged to establish settlements on the frontier in present - day Texas as a defensive bulwark to Comanche raids further south .
In contrast to the neglected military capabilities of the Mexicans , authorities considered Americans as extremely aggressive in combat and they were subsequently encouraged to establish settlements on the frontier in present - day Texas as a defensive bulwark to Comanche raids further south .