Catching the worlds smallest bird

I was with a military unit.  We had to occupy a building that was like a locker room with lots of rows of lockers.  We had to hid for a few minutes while enemy soldiers walked through looking for us.  They did not look very carefully because they just walked right past us without even seeing us.  After they left we had some tasks to do.  One of them was to catch a very small bird.  I caught one in my hand and it was about the size of a dragon fly.  It had translucent wings the same as a dragonfly and buzzed when I carried it.  We put it in a cage except the the bars were too wide and the bird got away.  The building we were in was laid out on a slope.  The high part of the building was where we had to go to catch the bird.  Down on a lower level we had to set up some large guns that were part of the defense.