In Fahrenheit 451, Montag has to go through many trials in order to eventually escape the city. At first, when Montag realizes he has been caught keeping books, he kills Captain Beatty. Additionally, he fires a flamethrower at the other two firemen that are at his home, so he can escape. After he does this, he realizes that the Mechanical Hound is still there. Montag manages to fire another flamethrower at the Hound, but not before it injects his leg. Montag is able to flee his home, even with the numbness running through his leg.
These are not all the trials that Montag had to endure in order to escape. As soon as he has killed Beatty, the other firemen are after him. Montag eventually makes his way to Faber's house where Faber advises him to head to the river and follow the railroad tracks. Before Montag leaves, Faber gives him a change of clothes, and Montag tells him to burn everything he has touched. This will help throw the Hound off the trail, because he won't be able to track Montag's scent.
As Montag is running towards the river, helicopters are trying to track him, and the rest of the city has been advised to be on the lookout. He is able to make it to the river before anyone catches him. When he arrives, he jumps into the river, pours liquor over himself, and changes clothes to get rid of his scent.
Montag continues his journey by walking alongside the railroad tracks and eventually makes it into the wilderness where he meets other people who share his same beliefs.