| Australian Commonwealth Horse | |
|---|---|
 Troops of 1st Battalion, Australian Commonwealth Horse in the Transvaal 1902. | |
| Active | 1902 |
| Country | Australia |
| Allegiance | British Empire |
| Branch | Army |
| Type | Mounted infantry |
| Size | Eight battalions |
| Engagements | Second Boer War |
The Australian Commonwealth Horse (ACH) was a mounted infantry unit of the Australian Army formed for service during the Second Boer War in South Africa in 1902 and was the first expeditionary military unit established by the newly formed Commonwealth of Australia following Federation in 1901. Over 4,400 men enlisted in the ACH in three contingents, with troops and squadrons raised in each state and combined to form battalions. Eight battalions were raised, with the first arriving in Durban in March 1902.[1] The 1st and 2nd battalions saw limited active service, conducting patrols against the Boers during the last great drives that ultimately ended the war. The war ended before the remaining battalions arrived to see action, and by the time peace came on 31 May 1902, the majority of the third contingent, consisting of the 5th, 6th, 7th and 8th Battalions, still remained at sea bound for South Africa.[2] The ACH suffered no fatal casualties in action, although 28 men died from illness.[2]