And then, the meaning of the phrase is "the one who wants to drink and sits on the horse plays the pipa and urges him to go to war" (personal interpretation).

Shun, pipa in ancient China is a general term for a musical instrument that is played either vertically or diagonally on the body. So the pipa here could be any one of the instruments now named: ruan, qin, yueqin, liuqin, sanshin, pipa, etc.

Then again, in ancient times, the pipa was a common instrument used on the battlefield because it could produce the sound of the jingo, which was so beautiful.

Sweat 、、、、I was a student of the pipa, so I know a little bit 、、、、