Although Brennan had gone into the election holding Batman with a comfortably safe majority of 25.8 percent, he was defeated by United Australia Party challenger Samuel Dennis on an unheard-of swing (the biggest in Australian electoral history until that time) of 26.6 percent. He recovered Batman in a rematch against Dennis in the 1934 election and held it until his retirement in 1949.
Although Brennan had entered the election maintaining a secure 25.8 percent majority for Batman, he was ousted by Samuel Dennis of the United Australia Party due to an unprecedented swing of 26.6 percent. He reclaimed Batman in a rematch against Dennis in the 1934 election and retained it until his retirement in 1949.