Wow this guy is a total idiot.
He had 16 years time to think and plan for that day, and what he came up was a wall and a bunch of swords, and him soloing the whole stampede? Geez what a dummy.
I don't remember the name, but there's this other similar manga with a similar setting (mc being reborn to same timeline/life as before etc), and there was similar event (can't remember if the village was being attacked, but something of that sort), and in that he basically told his parents the whole deal of him having his memories.. And they actually believed him, and they made a plan together with his information.
I think this protagonist is just plain stupid (& stubborn), for not using all the resources that he had available.. He could've just told'em that he just knows that there's monster stampede coming, so evacuate children/women a day before to safety, and arm up the men, and even hire mercenaries/adventurers to defend the village.. Those walls look pretty big, I bet the villagers could climb on it and shoot/throw/drop shit from there (if they just had the means/plans beforehand to get up there that is)
He should've at least tried..
Even if they would've not believed him, and had even ridiculed him.. they damn sure would've at least made sure to take him seriously every time after that.
So all in all I like my protagonist being intelligent, and making good preparations, more so than just doing stupid and reckless "cool" fighting alone.