Battalion of detachments
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A battalion of detachments is a term used to refer to battalion-sized units of the British Army formed from personnel drawn from several parent units. They were used to temporarily collect together detached companies or individual stragglers into more manageable-sized formations for logistics purposes or to provide additional fighting forces. Two longer-term battalions were raised by Arthur Wellesley in 1809 for service in the Peninsular War. These comprised stragglers left behind following the British withdrawal at Corunna and saw action in the Oporto and Talavera campaigns before they were disbanded and the men returned to their regiments. Though effective on the battlefield criticism was made of their discipline in camp and on the march and there was concern over the impact on manpower in their parent regiments. Other battalions of detachments were later formed in the field from British and foreign units in the peninsula and during the Walcheren Campaign. Three units of British line infantry were formed from depots in England in 1814 but saw no action before the hostilities ceased after the Treaty of Paris. Similar units were employed as late as the 1857 Indian Mutiny.