Narrative of the Expedition of an American Squadron to the China Seas and Japan (1856 report on the 1852-1854 Perry expeditions written by Francis L. Hawks; authorized by Matthew Perry)
Examples (9 in total)
楽しいえんせいになりそうだ。
It looks like it will be a fun expedition.
えんせい先、ようやく決まったのね。
So the destination for the expedition has finally been decided.