Oh man, outnumbered battles really rile me up.
@musicfreak12 if Antrim can dish out some very advanced tech and tactics (which is what they're trying to do), they might just win. There's quite a few examples of outnumbered defenders that won through this, like Rorke's Drift (200 vs 3k-4k) or Nekmíř (400 vs 2k).
Another is just superior maneuvering, but their troops seem to be of low quality as mentioned, so this may not be possible. An example of this would be Alesia (30k-50k vs 300k-500k). Imagine besieging a numerically-superior opponent while getting besieged by another, even bigger enemy, and winning anyway.
Heavily-outnumbered battles are very thrilling to read. Here's a couple more examples: https://en.wikipedia.org/wiki/Military_Victories_Against_the_Odds