Expedition
Campaign
noun, verbal noun, の adjective
えんせい
克服 (こくふく) Conquest
征服 (せいふく) Conquest, Subjugation
制覇 (せいは) Conquest, Domination, Mastery
遠征 (えんせい) Expedition, Campaign
沿線 (えんせん) Along The Train Line, Along The Railway
He led an Expedition to Ensenada えんせい
The Expedition ends えん when I say せい so.