Let's send our cavalry charging blindly into the darkness to fight an enemy they can't see

Exactly what I was thinking. Wait instead for the enemy army to advance - "out-psych" them in the "waiting game". Bombard them with fire using the catapults when they come within range. The White Walkers clearly took advantage of the night hours to pressurise the human army.

What bothered me about the Dothraki charge is that NO-ONE ORDERED THEM TO, they just rushed in on a whim. Someone correct me if I'm wrong.

What army ever had to fight against an army of dead people?

I don't get why they wasted the Dothraki. Playing devils advocate, maybe calvary are most effective when they charge so they were pressing what they thought was an advantage when they had one? If Mel hadn't lit up their swords maybe they wouldn't have charged? They were pure fodder. Surprised Jorah and Ghost made it out of that alive.

btw, who gave the command?
Dany & Jon were far away, Jorah seemed to be in command – but I didn’t hear or see him give the order to attack. Did I simply miss that moment?

Like a lot of things in this show now, the fire swords / charge into darkness was meant to be a cool, atmospheric visual. And it was.

Logically, not so much.

I’m sure someone could argue that the Dothraki are such experienced horse raiders that they’ve battled at night plenty of times.

Or that it was only supposed to appear pitch black to the TV viewer at home, not the Dothraki, who could see/hear where the army was advancing.

Anyway...