Maybe that was the guy who invented limericks?
That seems impossible. The limerick was so well established that Kipling, in a short story published in 1926, quoted as a childhood remembrance a limerick published in Punch Magazine no later than the early 1880's:
Chacque epoque a ses grands noms sonores,
De tous ce defunts cockolores
Le moral Fenelon,
Michel Ange et Johnson
(Le Docteur) sont les plus awful bores.
(As is common in Punch, the poem is barbed wit)
The meter is well established.
Moreover, in this same remembrance there is mention of a traditional accompaniment or chorus to limerick contests (similar in many respects to modern 'rap-offs' and 'filking' contests) sung by the audience between competing limericks:
Oh, won't you come up, come up?
Oh, won't you come up, come up?
Oh, wont you come up,
Come all the way up,
Come all the way up to Limerick?
I do not know how old the limerick is, but it is certainly far too ancient to have been invented by a fellow killed in World War One.