2 adjectives to describe rearguard

The experience showed that the slow advance guard ponies are forced out of their place by joining with the others, whilst the fast rearguard is reduced in speed.

The troops were called upon to carry out very long marches in great heat without water, to make attacks on stubborn rearguards without time for reconnaissance, and finally to suffer cold and privation in the mountains.

2 adjectives to describe  rearguard