Why did Napoleon end his resistance after the capture of the Montmartre heights by the Russian troops?

At that time, Napoleon withdrew to the east of the country in order to draw off the forces of the coalition, and weaken their onslaught on Paris. True, the allies managed to find out that the defense of Paris was weak, and therefore, the coalition troops continued the assault. Thus, soon after the capture of the Montmartre heights, the Parisian garrison capitulated, and Napoleon, not wishing to unleash a civil war, was forced to admit defeat.