FORWARD "?"

On the parade,
Soft and low,
Rookie hiccoughed,
"Forward, Ho!"
Another youngster
Feeling smart,
Tried to shout,
"Forward, Hart!"
One requested,
"Forward, How!"
From somewhere else,
There came a "Yow!"
* * * * * *
Perhaps a mile or so away
We heard not "Harp!" nor "Harch!"
But stalwart Major Koehler's voice
Thunder, "Forward, March!"