Shenandoah (2-1, 2-1 ODAC), which scored its lone run in the first inning, had two of its four hits in that opening frame.
Arens then scored the first run of the game when Michael Paul reached on an error by W&L shortstop Taylor Rowe.
The Generals (3-1, 1-0) answered with one run in the third and three more in the fourth off of SU starter Tyler Hott (0-1).
Hott allowed the four runs on six hits and two walks against four strikeouts in 6.0 innings of work.
Matt Wilson gave up just one hit and walked one in working the eighth and ninth.
Drew Shott (1-0), who pitched the third and fourth for W&L, got the win. He struck out two in his two innings of action.
Five Generals pitchers registered seven strikeouts against the SU hitters.
Shenandoah is back in action tomorrow at 1:00 in a non-league game at Mary Washington.