Sir Arthur Haselrig's Regiment of Horse, better known as the London Lobsters, was a Parliamentarian heavy cavalry regiment raised in 1642 and commanded by Colonel Sir Arthur Haselrig during the First
Armour of a 17th-century cuirassier, such as was worn by the Lobsters. The all-enclosing close helm (in this case in the "Savoyard" style) could have been replaced by a more open form, such as the lobster tailed pot.
The harquebusier was the most common form of cavalry found throughout Western Europe during the early to mid-17th century. Early harquebusiers were characterised by the use of a type of carbine called
London Lobsters
…Parliamentarian cavalry units able to stand up to mounted charges by Cavalier horsemen during the war's early years. The regiment was re-equipped as harquebusiers in 1644 and absorbed into the New Model Army in April 1645, when Haselrig relinquished command to John Butler; as was then the custom it was renamed…
Harquebusier, carbine-armed cavalry, 17th century
Gustavus Adolphus (centre) leading a mixed-cavalry charge, c. 1632. Painting by Jan Martszen de Jonge, 1634
Snaphaunce carbine, c. 1660s
English-made very high quality harquebusier armour of Pedro II of Portugal: an engraved cuirass, bridle-hand gauntlet, buff coat, and 3-barred lobster tailed pot helmet