Keyes' diary makes it clear that Mayne was brought before the divisional commander, Brigadier Rodwell, on 23 June, for assaulting Napier, the second-in-command of his battalion. Mayne had a grudge against Napier, who had not taken part in the Litani raid, and who, according to a serving member of 11 Commando, had shot Mayne's pet dog while Mayne had been away. Mayne was attached to his pet (there is a famous photo of him carrying a dog on his shoulders), and was furious about this. Keyes' diary records that, on the evening of 21 June, after drinking heavily in the mess, Mayne waited by Napier's tent and assaulted him when he returned. Keyes also records in his diary that Mayne was dismissed from 11 Commando the following day, 23 June, but does not say that he was arrested.