After Caesar's preliminary low-scale invasions of Britain, the Romans invaded in force in 43 AD, forcing their way inland through several battles against British tribes, including the Battle of the Medway, the Battle of the Thames, the Battle of Caer Caradoc and the Battle of Mona. Following a general uprising in which the Britons sacked Colchester, St Albans and London, the Romans suppressed the rebellion in the Battle of Watling Street and went on to push as far north as central Scotland in the Battle of Mons Graupius. Tribes in modern-day Scotland and Northern England repeatedly rebelled against Roman rule and two military bases were established in Britannia to protect against rebellion and incursions from the north, from which Roman troops built and manned Hadrian's Wall.