with (one's) guns blazing

Forcefully and with all of one's energy and a strong sense of urgency or purpose, especially when directed at an argument or problem that has angered or frustrated one. The senator started the press conference with guns blazing, forcefully denying the accusations and painting his accusers as pathological liars. The home team fell behind by a large margin in the first half, but you can expect them to come out with their guns blazing in the second half.

with (all) guns blazing

with great determination and energy, often without thought for the consequences. informal