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.
Despite having a comfortable 25.8 percent majority for Batman heading into the election, Brennan was defeated by Samuel Dennis of the United Australia Party with an extraordinary swing of 26.6 percent. He won back Batman in a rematch against Dennis in 1934 and held onto it until his retirement in 1949.