Jack,
Thanks for contributing. I think our service time is about 35 years apart but not a lot has changed. I'll defer to your knowledge.
Correct me if I'm wrong: The group level of F&M depends on the range to the objective and level of defensive fire. At longer ranges of over 300m you may F&M as a Platoons with the objective under mortar fire, probably 60mm but you may have 81s. As you get closer to the objective and/or defensive fire increases, you start to F&M in smaller groups down to the fire team level or maybe individuals crawling close enough to deliver grenades. It's a different and scary perspective at ground level. My recollection is practicing mainly as fire teams within a squad starting from 50-75 yards. Of course, I probably would not know what's going on elsewhere or on my flanks as I was concentrating on my tasks and could not see the big picture.
Realistically, the Squad Leader should not be contributing to the squad firepower as he is too busy supervising and observing except in extreme situations.
On the assault, you need to watch your ammo as you won't get a resupply until the assault is over. What amount of ammo a Rifleman carried on an assault would have varied. Two bandoleers of M1 clips weights less then 10 pounds and gives you 96 rounds.
Westerners are using basically the same tactics in Ukraine: 155mm Arty on objective until getting within 100-200m from the target. Then start the 82mm mortars and grenade launchers for suppression. Defenders know that as long as artillery is dropping on them they won't be close assaulted. When it stops you come out of your bunker ready to defend, if you are able to. But now that the artillery may have stopped you'll be greeted by kamikaze drones.
Depending how well you know the mortar guys and trust them, you may get to 25m of the trench before having the mortars add 50m and continue the bombardment behind the defenders while you do the final assault IF they have enough ammo which was a problem often.
The F&M is used differently. Once an assault is detected the Kill Chain for 82mm mortars is from 20 seconds to a few minutes. You need to move quickly to get into the trenches.
During the Battle of Bakhmut one Western group built their own jammers so the Russian defenders could not call for support. Normally 10-15 guys will assault an objective.
Everyone in the group is normally advancing and shooting, even if a target is not clearly identified as it does suppress the enemy and the more noise you make the more of a negative psychological impact you'll have on the defenders. The quicker you get to the trench line to better your chances. Don't stop.
If the bombardment is effective and timed enough, the defenders will just be coming out from their bunker as you get to the trench line. Now you've seized the initiative.
Trenches can be well built zigzag ones with shelters or just individual scattered fighting holes. At this range hopefully you have a drone to ID targets and direct the throwing of hand grenades. Grenades win trench fights.
Underground bunkers always get a grenade or a half-kilo of C4. Grenades rarely kill if you have body armor but just a few seconds of suppression allows the attacker to move to you from the other side of a trench. Also, you can try to avoid them to an extent.
From what some Westerners have told me, when assaulting a trench you may carry up to 15 loaded 5.56mm mags and at least 6 grenades. You'll normally see a somewhat rounded pouch like a cloth bucket they carry on their left side. This is to throw their empty mags into to reload later as some guys bring up ammo cans to reload. Normally someone carries and RPK or PKM.
On assaults, many guys don't carry mags on their front plate carrier because you stick up higher when seeking prone cover.
A good team with a coordinated rush has a good chance of getting to the enemy trench line where you are safe from indirect fire and a little safer from drones. Some teams will "attempt" to drive a vehicle right up to the trench line and drop guns off directly into the trench. Speed is life.
Assaults go wrong when coordination breaks down and the defensive fire forces guys to hit the deck, you can't do that because very quickly mortars will adjust on you. That's when the attackers start getting killed. The defenders rarely counterattack out of their trenches.
The big problem in Ukraine right now is a 3-6 mile wide no mans land that needs to be crossed as fast as possible. APCs attract a lot of attention. Dirt bikes can work well. Going on foot is the worst. Ukraine may have only a half dozen guys defending a 500m trench line. Fog is an infiltrators friend.
Previously you attacked from your tree line to theirs about 200-1000m across flat land. Those days seem to be over.
Wolfhag