Extensive guerrilla warfare characterized the trans-Mississippi region, as the Confederacy lacked the troops and logistics to support regular armies that could challenge Union control. Roving Confederate bands such as Quantrill's Raiders terrorized the countryside, striking military installations and civilian settlements. The "Sons of Liberty" and "Order of the American Knights" attacked pro-Union people, elected officeholders, and unarmed uniformed soldiers. These partisans could not be driven out of Missouri, until an entire regular Union infantry division was engaged. By 1864, these violent activities harmed the nationwide antiwar movement organizing against the re-election of Lincoln. Missouri not only stayed in the Union, but Lincoln took 70 percent of the vote to win re-election.