Describe Crusoe's brother?

Crusoe had two brothers. One brother was killed in the Battle of Dunkirk. The other brother seems to have disappeared.

I had two elder brothers, one of whom was lieutenant-colonel to an English regiment of foot in Flanders, formerly commanded by the famous Colonel Lockhart, and was killed at the battle near Dunkirk against the Spaniards. What became of my second brother I never knew, any more than my father or mother knew what became of me.

Where did the ship take them in the hurricane?