Courtney Cranston had 18 points and eight rebounds to lead the Titans home win.
Alexis Raymore added 15 points, all coming on 3-pointers, as Union (7-5, 2-3) moved into third place in the 4A Greater St. Helens League.
Union pulled away in the fourth quarter, outscoring Battle Ground 14-6. Becca Barney had two steals in that quarter.
“It was a good competitive game,” Union coach Mike Cranston said. “We’re both kind of fighting for a playoff spot. In the fourth quarter we got after them a bit. Our press got going.”
Kayla Cruz and Morgan Stradley each scored eight points for Battle Ground (5-6, 1-2).
UNION 49, BATTLE GROUND 33
BATTLE GROUND — Kayla Cruz 8, Dani Stillson 0, Anna Brinton 3, Morgan Stradley 8, Brianna Adams 4, Madison Mukensnabl 0, Kelly Poteet 6, Emeline Akengue 4. Totals 11 (5) 6-13 33.
