Alone in the woods, how does Henry justify his flight? When Henry enters the chapel of trees, does he find comfort? Explain?

Henry compares himself to the squirrel running away when he threw an acorn at it...... he sees his own flight in the same way....... simply a reaction to fear.

The second part of your question comes from Chapter Seven. To a certain extent, the chapel of trees does give Henry some solace away from the harshness of battle. Here Henry connects with nature which seems immune to man's dark battles......

"After a time the sound of musketry grew faint and the cannon boomed in the distance. The sun, suddenly apparent, blazed among the trees. The insects were making rhythmical noises. They seemed to be grinding their teeth in unison. A woodpecker stuck his impudent head around the side of a tree. A bird flew on lighthearted wing.Off was the rumble of death. It seemed now that Nature had no ears.This landscape gave him assurance. A fair field holding life. It was the religion of peace."