I'm not sure if this counts as a poem, but it is from the right time period and has the phrase "the battle of pea-soup" in it: http://www.nls.uk/broadsides/broadside.cfm/id/15968/transcript/1 See if it is what you are looking for.
Battle of Colenso - 1900 I was released on: USA: January 1900
Battle of Colenso - 1900 II was released on: USA: January 1900
Battle of Colenso - 1900 IV was released on: USA: January 1900
The Battle of Mt- Ariat - 1900 was released on: USA: March 1900
Robert Ireland - footballer - was born in 1900.
British Infantry Marching to Battle - 1900 was released on: USA: March 1900
It was invented before WWI so probably around 1900-1910.
Life for men in Ireland in the 1900's was not easy. These men had to work all day and for very little money to support their families.
conflict over whether Ireland should be separated from the u ited kingdom
Battle of Mazocoba happened on 1900-01-18.
Battle of Beitang happened on 1900-09-20.
Battle of Paardeberg happened on 1900-02-27.