The shield would be on your back to be able to get it off for blocking purposes.
There are arrows fired even when two armies are engaged
A shield is probably not going to hinder your swing if it is on your back. Think about it. It is the practical way to carry a shield unless you have it on your arm for some reason.
A person who knows he is going to be in battles can have his shield ready to go from his back fast, it certainly does not have to be a slow process getting your shield off your back to block with it. Plus the raise your shield fast to block if you do not have your two handed weapon equipped if I remember correctly can be done if you have the shield on your arm at the time. I don't know if I clarified that.
Ok, so are you going to ask your attacker "hey, hold on a sec!. Let me get my shield off my back. Ok, now I blocked you, let me put my shield back on my back so I can whack you with my sword".?
You say "probably", as in obviously you really don't know. I tell you what, try this lil' experiment:
Swing a bat a few times.
Attach trash can lid (which is waaayyy lighter than a shield) and strap it on your back.
Swing the bat a few times.
Tell me the difference between swinging the bat with and without the trash can lid on your back.
And while you are at it, between swings, take the lid off your back and pretend to block something, then put it back on your back.
Tell me how fast you did it.
You think about it: if the shield is not secure on your back, when you swing, especially with a 2 handed sword, it is going to swing left to right and disturb further swings, maybe even hurt you.. If it is properly secured, you won't be able to quickly unfasten it to use it to block.
The only practical way to carry a shield into battle, in on your arm. Period.
Yeah, arrows were shot when armies were engaged...You not only kill the enemy, but your troops as well. BRILLIANT! Please...
Dude stop trying to sound right, if a weaker man with the coordination etc can do what you spoke of with a one handed weapon, and larger man can use a two handed weapon the same way as a one handed weapon given he has the coordination etc, and the STRENGTH.
Actually, he knows what he's talking about. It is just not about the weight, but also leverage and momentum. Simple physics. The longer the blade is in relation to the length of your arm, and the further away the center weight is from your hand, the harder it is to wield, no matter how strong you are.