彼は戦争が早々と終わるとあてこんでいた。

He gambled on the war coming to an early end.

彼(かれ)は戦争(せんそう)が早々(そうそう)と終(お)わるとあてこんでいた。

Kare wa sensō ga sōsō to owaru to atekondeita.

彼 (かれ)

he; him; his; boyfriend

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

戦争 (せんそう)

war

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

早々 (そうそう)

as soon as...; just after...; immediately after...; hurriedly; in haste; quickly; promptly; early

と (と)

if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)

終わる (おわる)

to finish; to end; to close

当て込む (あてこむ)

to count on; to anticipate; to expect

Readings: ヒ、かれ、かの、か.の

Meanings: he, that, the

Readings: セン、いくさ、たたか.う、おのの.く、そよ.ぐ、わなな.く

Meanings: war, battle, match

Readings: ソウ、あらそ.う、いか.でか

Meanings: contend, dispute, argue

Readings: ソウ、サッ、はや.い、はや、はや-、はや.まる、はや.める、さ-

Meanings: early, fast

Readings: シュウ、お.わる、 -お.わる、おわ.る、お.える、つい、つい.に

Meanings: end, finish