Yikes, that didn't work at all. Let me try a more narrative description. . .

(F) When Boney (Bf)com (F)mand (C)ed
His (Bf)armies to (F)stand
He (Bf)levelled (F)his (Dm)cannon
Right (C)over the (Bf)land
He (F)levelled (Bf)his (F)can (C)non
His (Bf)victory to (F)gain
And he (Bf)slew my (F)light (Dm)horseman
On the (C)way coming (Bf)home

Hope that's intelligible, it's too late at night for me to come with another creative solution. . . Margaret