Action Stations, page 86:

He had left his oldest friend, Harga, in charge. It was the type of task to Harga's liking. A strange one, war had lost its appeal for him. Perhaps he had seen too much at the Battle of Karing, with the death of all his own cubs; it was after Karing that the questioning had begun. And it was through Harga that the warnings had come. Bizarre how the old warrior now claimed fiendship with one of the captives, but Vakka had to admit he could not help but admire the human as well.