at the front
A mi Herbert también le han mandado a luchar en el frente.
My Herbert has also been sent to fight at the front.
— El tambor de hojalata (1979)
Debería pasar una noche en el frente, teniente.
You should spend a night at the front, Lieutenant.
Perdieron la guerra en el frente del Este.
They lost the war on the Eastern Front.
Estuvo tres meses en el frente.
He was on the front lines for three months.
Pegado en el frente de su casa, frente a su apartamento.
It was posted on the front of his house, across from his apartment.
— Elephant (2003)
It's at the front, sir.