Thanks very much, Tom. The notes are very enlightening. Shows what I know--I was not even familiar with the Swinburne poem (and only have an old New Directions Paperbook Collected).
I forgot to point out this site, the Wilfred Owen Multi-Media Archive:
http://www.hcu.ox.ac.uk/jtap/
It is one of the most amazing scholarly sites for any single poet on the web (though also has information on the WWI and Georgian poets generally), and cost Oxford a small fortune to set up. You can view facsimiles of all the poems in manuscript, hear Real Audio interviews with veterans, you name it. Definitely worth a visit.