It appeared that they were directing their full efforts to the carjacking/chase/and then Watertown thereafter. Just amazing that they made this decision to use almost full force when there existed a chance that they were going after the wrong people and giving them, the identified suspects, that much more time to flee.
(Though why they didn't flee in the prior three days is still beyond me and a topic of further discussion - I believe they were just cocky enough to think they wouldn't get caught, but again, that's a topic for another discussion).
They had a decent sized contingent out with them at first, but what I saw and heard I wouldn't call "full force" until well after it was reported the first one they caught was "bomber #1."