ALP PM of Welsh ancestry, walked out of caucus.

“Let all who support me, follow me.” Then he walked out of the room, followed by 23 of the 65 members of the party then present.
The parliamentary situation at the conclusion of these events was that the new Government, consisting entirely of Labour members, held its position mainly by the support of Liberal members. Of 75 members in the House of Representatives, Mr. Hughes had 13 direct supporters, and in the Senate 11 in a House of 36. But the Liberals were dependable supporters of whatever measures might be proposed for furthering success in the war, and the Prime Minister had no cause for anxiety about the continuance of this support.