As the Guadalupe River swelled from a wall of water heading downstream, sirens blared over the tiny river community of Comfort -- a last-ditch warning to get out for those who had missed cellphone alerts and firefighters going street-to-street telling people to get out. Daniel Morales, assistant chief of the Comfort Volunteer Fire Department, believes that long, flat tone the morning of July Fourth saved lives. The sirens are a testament to the determination of a community that has experienced deadly floods in the past, warning residents of devastating floodwaters that hours earlier had killed at least 118 people in communities along the same river, including 27 campers and counselors in neighboring Kerr County.