Artificial intelligent assistant

What do these lines mean in Ivor Gurney's "Laventie"? Could you please help me understand the meaning of a poem by Ivor Gurney, an Englishman who fought in the First World War. From his "Laventie": > Of Maconachie, Paxton, Tickler, and Gloucester’s Stephens; > Fray Bentos, Spiller and Baker, odds and evens > Of trench food, but the everlasting clean craving > For bread, the pure thing, blessed beyond saving. I highly appreciate your assistance.

Maconachie was a tinned stew named after the company which made it; T G Tickler was a Lincolnshire company who made tins of jam and marmalade, Fray Bentos was and is a brand of tinned ("corned" or "bully") beef named after the Uruguayan town where it was originally produced; Spillers and Baker's was a big, British milling company originally from Bridgewater but then with a large mill in Cardiff which is now luxury flats.

All those names were industrial food producers, I can't find any reference to Paxton's or Stephens (although Gurney was once a chorister in Gloucester cathedral) but from the context it would seem that they were large suppliers of tinned or otherwise preserved and packed food to the army.

I suppose that there may be a connection to Spillers dog biscuits and Baker's Complete tinned dog food but I don't really know!

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