Francis Johnson was a prolific African-American composer and bandleader in the 19th century. This march is characteristic of the martial, utilitarian style used in American social functions of the era.
At Henle 2 this is a beginner-level piece, where steady coordination between the hands is the main hurdle. The main demands: precise articulation — the difference between crisp and blurred is the piece; a left hand with real melodic or rhythmic responsibility of its own; and repeated-note passages that require controlled, springy fingerwork.
Ensure the left-hand chords remain steady and rhythmic like a military drum pulse.
Comparable difficulty and character — good candidates for what to learn next.
A level or two down with the same spirit — ideal if this piece is still out of reach.
Where this piece's skills lead: slightly harder works making similar technical demands.
Col. C. G. Child's March is rated Henle level 2 of 9 — beginner repertoire, roughly ABRSM grades 2–3. In the RCM system it corresponds to about level 2.
You should be comfortable at Henle level 2 — meaning you can already play level 1–2 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of Col. C. G. Child's March lasts about 2 minutes.
Col. C. G. Child's March is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Bunker Hill by Albert Von Tilzer, Christmas Bells March by Addison P. Wyman, 'Our Leader' March by Frederick Ellsworth Bigelow — see the full similar-pieces list on this page.