Who did John Brown believe he was acting for?

John Brown (1800-1859) - was an anti-slavery advocate who believed that God had called upon him to abolish slavery. May or may not have been mentally unstable. Devoted over 20 years to fighting slavery, due to misunderstanding, in revenge he and his followers (his sons and others) killed five men in the pro slavery settlement of Pottawatomie Creek. Triggered dozens of incidents throughout Kansas some 200 people were killed. Was executed, still debated over whether he is a saint or killer.