Yes, a commanding officer can absolutely be charged under Article 99 for failing to properly lead their troops during an engagement with the enemy. The UCMJ applies to all service members regardless of rank, and commanders are held to the highest standards, especially in combat. An officer’s failure of leadership before the enemy can be prosecuted under several clauses of Article 99.
The most likely charge would be “cowardly conduct,” which is defined as a failure to perform one’s duty as a result of fear. If a commander hides in a bunker or refuses to make tactical decisions because they are paralyzed by fear, that is cowardly conduct. Alternatively, they could be charged with “shamefully abandon[ing]” their command if their failure to lead effectively results in the unit’s collapse or surrender. They could also be charged with “willfully fail[ing] to do his utmost to encounter, engage…or destroy any enemy troops.” An officer’s primary duty in combat is to lead, and a willful failure to do so is a grave offense.
A military defense attorney defending a commander would have an incredibly difficult task. They would have to argue that the commander’s actions were not a result of fear or a failure of will, but were the result of a legitimate tactical assessment, however flawed it might appear in hindsight. They would need to present expert testimony on military tactics to show the commander’s decisions were reasonable under the extreme pressure and confusion of battle. The burden of command is heavy, and a failure to meet it in combat is treated with the utmost seriousness by military law.…