'But you, who do you say I am?, interrupted Jesus. It was then that Peter spoke the words that would prove fatal to the Master: "Thou art the Messiah, the son of the living God. Thou art he who is destined to liberate the people of Israel!" (Matt. 16:13-16) Jesus was startled by Peter's bold language. He commanded his disciples, who had heard Peter's confession, to tell this to no one. But the effect on Jesus was tremendous. For he suddenly saw himself in this new light. Peter's confession seems to have transformed Jesus' perception of his own mission.
When Peter had made his impetuous declaration, the band was already on the road to Jerusalem. They were, however, no longer a handful of just twelve disciples, for a few hundred men had by now attached themselves to the party. These were patriots, fishermen, and Zealots -- the feared Sicarii who hated the ruling tyrants abd who knew how to wield a knife or sword when needed.'
(Katz B, The Ways of an Atheist)