What to call the Confederate 43rd Battalion was a matter of contention during the war.
The members of the battalion were referred to as soldiers, partisans, rangers, and guerillas.
 
The Union viewed them as unsoldierly: a loose band of roving thieves.
 Northern newspapers and Unionists referred to them as guerrillas, a term of opprobrium at the time.
One of  Mosby's men, Munson stated in memoirs published after the war that "the term [guerrilla] was not applied to us in the South in any general way until after the war, when we had made the name glorious, and in time we became as indifferent to it as the whole South to the word Rebel."

Mosby himself avoided overtly militaristic words like "troops" or "soldiers" or "battalion" in favor of the more familial "Mosby's Men" or "Mosby's command".
What to call the Confederate 43rd Battalion was a matter of contention during the war. The members of the battalion were referred to as soldiers, partisans, rangers, and guerillas.  
The Union viewed them as unsoldierly: a loose band of roving thieves.  Northern newspapers and Unionists referred to them as guerrillas, a term of opprobrium at the time. One of  Mosby's men, Munson stated in memoirs published after the war that "the term [guerrilla] was not applied to us in the South in any general way until after the war, when we had made the name glorious, and in time we became as indifferent to it as the whole South to the word Rebel." 
Mosby himself avoided overtly militaristic words like "troops" or "soldiers" or "battalion" in favor of the more familial "Mosby's Men" or "Mosby's command".
43rd Battalion, Virginia Cavalry