That wasn't as bad as the Austrian archdukes getting commands repeatedly because of their position. Ferdinand ran from Ulm to avoid capture in 1805, leaving Mack and the troops to hold the bag.
At least Jerome wasn't a coward.
One of the reasons that Napoleon employed his brothers was to keep them out of trouble.
One of his letters to Jerome illustrates Napoleon's frustration with his brothers:
'You must be a soldier, and then a soldier, and again a soldier; bivouac with your advance guard, be in the saddle night and day, march with your advance guard to have the latest information, or else stay in your harem. You make war like a satrap. Good God, is it from me that you have learned that? From me, who, with an army of 200,000 men, am at the head of my skirmishers.'