The London Lobsters,[a] were a cavalry unit raised in 1642 and led by Sir Arthur Haselrig, a Parliamentarian who fought in the First English Civil War. The unit was one of very few units raised as cuirassiers, equipped in suits of plate armour reaching from head to knee. It had a somewhat chequered career in combat, but was credited with being one of very few Parliamentarian cavalry units able to stand up to the mounted charge of the Cavaliers in the early years of the war.
The unit was re-equipped as Harquebusiers in 1644, and absorbed into the New Model Army in April 1645, when Haselrig relinquished command to John Butler, and as was then the custom, it became known as Butler's Horse.
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