▁The ▁main ▁invasion ▁force ▁under ▁A ulus ▁Pla ut ius ▁crossed ▁in ▁three ▁divisions . ▁The ▁port ▁of ▁departure ▁is ▁usually ▁taken ▁to ▁have ▁been ▁Bou log ne ▁( ), ▁and ▁the ▁main ▁landing ▁at ▁R ut up iae ▁( Rich borough , ▁on ▁the ▁east ▁coast ▁of ▁Kent ). ▁Ne ither ▁of ▁these ▁locations ▁is ▁certain . ▁D io ▁does ▁not ▁mention ▁the ▁port ▁of ▁departure , ▁and ▁although ▁Su eton ius ▁says ▁that ▁the ▁secondary ▁force ▁under ▁Claud ius ▁sa iled ▁from ▁Bou log ne , ▁it ▁does ▁not ▁necessarily ▁follow ▁that ▁the ▁entire ▁invasion ▁force ▁did . ▁Rich borough ▁has ▁a ▁large ▁natural ▁har bour ▁which ▁would ▁have ▁been ▁suitable , ▁and ▁arch ae ology ▁shows ▁Roman ▁military ▁occupation ▁at ▁about ▁the ▁right ▁time . ▁However , ▁D io ▁says ▁the ▁Rom ans ▁sa iled ▁east ▁to ▁west , ▁and ▁a ▁journey ▁from ▁Bou log ne ▁to ▁Rich borough ▁is ▁south ▁to ▁north . ▁Some ▁histor ians ▁suggest ▁a ▁sail ing ▁from ▁Bou log ne ▁to ▁the ▁Sol ent , ▁landing ▁in ▁the ▁vic inity ▁of ▁Nov iom ag us ▁( Ch ich ester ) ▁or ▁South am pton , ▁in ▁territory ▁formerly ▁ruled ▁by ▁Ver ica . ▁ ▁River ▁Batt les ▁British ▁resistance ▁was ▁led ▁by ▁T og od umn us ▁and ▁Car ata cus , ▁sons ▁of ▁the ▁late ▁king ▁of ▁the ▁C atu vel la uni , ▁C un ob eline . ▁A ▁substantial ▁British ▁force ▁met ▁the ▁Rom ans ▁at ▁a ▁river ▁crossing ▁thought ▁to ▁be