Complex sentence: As was the case with the "Dixie Blues", its service was brief; 7 of its number would also re-enlist for "3 years or the war" with R. H. M. Davidson's Company in March of 1862.
Split into simpler sentences: As was the case with the "Dixie Blues", its service was brief. All told, 7 men from each company would re-enlist for "3 years or the war" with R. H. M. Davidson's Company in March of 1862.