When two armies charge against each other on the battlefield in the Cold War era, why are the men in the first platoon so brave that they dare to face the lance poking at them?

Because it's a movie, so it looks good to be shot that way...

There is no such thing in actual combat.

The line of charge was loose, and there had to be at least half a man's gap between them, otherwise they couldn't run at all...

And, when breaking through the lance formation, it was not a head-on collision, because the infantry's charging distance did not need to be that long, and because no one would really run into the tip of the lance...

When attacking the lance formations, they are first dialing and hitting the lances to hinder the opponent's poking and stabbing, as well as some of the soldiers with short weapons from the ground to roll close to kill the opponent's lancers, and if possible, they will also throw all kinds of projectiles, and so on to create enough gaps, before launching a charge.

And all of the above, but also very rare each other into physical combat when the situation will occur, in fact, most of the combat is the first to use all kinds of projectile weapons to attack the other side, and wait for the other side in the long-distance strikes due to demoralization or physical attenuation, the formation appears to be broken, before entering the stage of physical combat.

That is to say, the actual cold weapons combat, fight up the pace is actually very slow, in most cases are with long-range weapons you to and from the attack on the opponent, usually fight for several hours and no results, can not have the kind of movie to come up to the rampage.

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Oh yes, I forgot to say, in fact, the Lord of the Rings movie in this episode, the lance formation is imitation of modern lance formation, that is, there are muskets after the formation, the cold weapons era of the lance formation and that is actually not the same.

Additionally, many of the cold-weapon formations in war movies are modeled after modern formations, which are neater and tighter, and better looking...

These formations are also modeled after modern formations.