It's a song about two armies of similarly constructed but different coloured robots on their march to war against one another.
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Two robot armies marching to war.
Let's say there's a red army and a blue army.
They're both very similar in design, both robot armies.
There are cubic little robot footsoldiers, robot captains, as well as robot tanks and heavy artillery-bots. They're fairly evenly matched.
Whatever their reasons for fighting, neither robot army is in the right or the wrong. It's merely their job, their programming.
The song sonically details the journey to this last stand.
They march to war, and eventually get there and begin the fight.
Both armies are obliterated.
[And it's all a big metaphor.]