The word which best explain Napoleon portrayed in the painting is Weakened.
The particular picture is of a war between Napoleon and Russia in which Russia got victory over Napoleon. In 1812, this was a turning point in the life of Napoleon and the army defeated and reduced to twenty percent of their initial capacity.
The victory made a paradigm shift and Napoleon's dream of invading Europe suffered a jolt.
On September 7, Battle of Borodino was fought just 75 miles away from Moscow, between French and Russians and losses happen at enormous on both sides. Russian withdrew and left the way open to enter Napoleon.
All the troops of Napoleon died due to starvation or the wounds from the previous war. As it was winter, French do not had any knowledge to survive with the changing weather and thus retrieve back to France.
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