Have you ever seen a big-budget Hollywood movie about World War II? There's always a lot of fighting and action, and then, sometimes, at the end, it cuts to an old veteran remembering the war and his lost buddies. We imagine that guy narrating this poem.
To us, it seems like the speaker was there. He remembers the charge, and he wants to pass on the story of the heroes who charged and died on that day. You can hear the power of his memories and his patriotism behind every word. He sees the tragedy of war, but also the positive side, the things it brings out in men. He wants you to see this too. He wants to stir you up, to make sure you don't forget. Sometimes he might get a little carried away, maybe he's a little sentimental sometimes, but it's impossible not to like him and respect him.
That's how we picture the speaker. How do you see him?