The message from William B. Travis exemplifies a rallying cry for support and resilience in the face of adversity during the Battle of the Alamo. His appeal to liberty and patriotism likely encouraged Texans to plead with the United States for support, as it highlighted their struggle for independence and the need for solidarity in their fight against oppression. Thus, the most appropriate response to the question would be:
Encouraged Texans to plead with the United States for support.