Oh boy - no mucking about with plot here. Just unremitting violence that starts about 2 seconds in to the cartoon. Produced in 1943, the year when everyone released a short called 'Yankee Doodle (something)' (unless they were German I suppose), this one is crammed full of wartime references - even an acknowledgment of wartime paranoia in the parodic poster in Jerry's hole, which reads something like "That friendly rat may tell the cat".
Jerry is cast as an officer in some mouse army (I assume we should read 'The USA' here) and Tom I suppose represents the Axis powers. In any case this is a pretty superficial excuse for a cartoon of frantic, non-stop violence, explosions and general mayhem as Tom and Jerry do their usual thing - though perhaps with a little extra abandom here. Household items are cleverly conscripted as weapons by the mouse, who generally outsmarts Tom at every turn.
The animation is excellant, though it lacks the artful timing that Warner was starting to master . But Tom and Jerry isn't really about timing or even characterisation. Certainly in this case anyway, it's basically an excuse for two characters to try and kill each other for 7 minutes.
I think I would like this a bit more, and Tom and Jerry cartoons more in general, if Jerry didn't inevitably come out on top all the time. I know this is the code that Warner adhered to in all of their X versus Y cartoons as well, but I prefer the ones where Jerry doesn't get everything his own way.
Won an Oscar. Did it deserve it? Well, I haven't seen every cartoon from 1943, but OTTOMH I can't think of anything obviously better. This was probably the ticket at the time.
For me, it's enjoyable, but if you like frenetic chase-style mayhem, this will be close to nirvana.