You can see the evidence in the way his soldiers marched into battles endlessly and refused to shoot him when his enemies in the upper echelons of society ordered them to even after the terrible Russian campaign
Why was he so loved by his soldiers?
Because he took dick from all of them
He had the apple.
Bigger hat=tighter asshole
The way any leader is revered is for saliently NOT taking ANY dick, even if it isn't offered.
Some soldiers didn't like him though, like after the Egyptian campaign.
French people naturally love their masters/heroes
For a few reasons. Firstly he genuinely did care for the well-being of his soldiers and his top priority was making sure they had enough rations, enough ammunition and especially satisfactory footwear (seriously, read his letters during the Italian campaign, almost every single one of them to Paris is about demanding more shoes for his soldiers). In an emulation of Julius Caesar he also had a very laid-back attitude in interacting with them, like he'd walk among them, chat casually, even sleep and eat with them in the open, and he'd let them call him mocking but light-hearted nicknames. He was incredibly eager to congratulate them for their successes and reward them, almost single-handedly creating the tradition of personally rewarding them with medals. After every battle he would request the officers tell him who distinguished themselves, and no matter how low their rank he would promote them. He set up many orphanages and schools for orphans in France (including for girls, which was almost unheard of) and gave generous pensions to widows.
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A couple of notable anecdotes of his feelings towards his soldiers: during the Egyptian campaign, after the failed campaign in Palestine and as they were retreating back to Cairo, he gave orders for the wounded to get given horses and camels to ride, and for all able-bodied men to walk. When an officer came up and asked which horse Napoleon would rode, Napoleon physically hit the man and yelled that he would walk with the others (this is also the only recorded case of Napoleon striking a soldier of his).
Also, he visited a hospital filled with soldiers infected with the plague and sat with each of them, talked to them and encouraged them, even though he very likely would have gotten infected himself. When he was forced to retreat because the Ottomans were coming, he was faced with the dilemma of what to do with his wounded. Not wanting them to be captured and tortured by the Ottomans (as they would have been) he gave orders for them to be poisoned so they would die peacefully and quickly. He apparently wept when he gave the order and left them.
Similarly, years later in the aftermath of the Battle of Eylau, where tens of thousands of Frenchmen had died for seemingly nothing (the battle was indecisive) he apparently burst into tears when his horse accidentally trod on a wounded soldier.
Far from the stereotype that he felt nothing for his troops and saw them as fodder, Napoleon was one of the few generals of his time that genuinely cared about them and made it known.
how did you write this in under 3 minutes?