I was certain of it now.

Sebastian was with the insurgents.
We made our way back to our laager, flung ourselves down, and slept a little on the ground before taking our turn in the fatigues of the night watch.

Our horses were loosely tied, ready for any sudden alarm.

About midnight, we three were sitting with others about the fire, talking low to one another.

All at once Doolittle sprang up, alert and eager.