Personal Opinion: -
Rubens' copy, one of many reproductions over the years, is the most faithful to Leonardo's original painting. It captures the drama and movement of the battle scene in detail. This was just the centre narrative of what would have been the full story of the days fighting, Rubens gives us a snippet of what could have been and by any standards has created a magnificent work of art.
If you can imagine that the original work was intended to be much larger than life-size and that the image above is just one part of the battle scene, you will have some idea of the sheer scale of this work. Let us say that your stride is three feet in length, pick a starting point, then do eighteen strides, look back at your starting point and you will see...that is one exceptionally large area!!! What a pity that the proposed paintings by Leonardo and Michelangelo are both lost.
Can you imagine these two vast works side by side in the same building?
What a tourist attraction that would have been, generations of art lovers on a pilgrimage to compare the styles of two of the most famous artists in history.
These two studies illustrate the detail and preparation that Leonardo lavished on this work. The expressions of the two soldiers can be clearly identified, even in the copy by Rubens. Leonardo worked on this project with his two assistants Raffaello d' Antonio di Biagio and Ferrando de Llanos throughout the first part of 1505. Leonardo left Florence for Milan in May 1505 and the work was abandoned. The parts that had been completed were protected by wooden boards, but the painting was finally lost in 1560 when Vasari re-decorated the chamber with his own frescoes, forty-one years after Leonardo's death.