 Despite serious set @-@ backs at <unk> , <unk> , <unk> , and <unk> <unk> in January — and with <unk> still under siege — the British mounted a five division counter @-@ invasion of the Orange Free State in February . The attacking force included a division of cavalry commanded by Lieutenant General John French with the New South Wales <unk> , Queensland Mounted Infantry and New South Wales Army Medical Corps attached . First , <unk> was relieved following the battles of <unk> River and <unk> , and the retreating <unk> defeated at <unk> , with the New South Wales Mounted Rifles locating the Boer general , <unk> <unk> . The British entered <unk> on 13 March 1900 , while <unk> was relieved . Disease began to take its toll and scores of men died . Still the advance continued , with the drive to <unk> in May including more than 3 @,@ 000 Australians . Johannesburg fell on 30 May , and the <unk> withdrew from <unk> on 3 June . The New South Wales Mounted Rifles and Western Australians saw action again at Diamond Hill on 12 June . <unk> was relieved on 17 May . 
