What Mars does in a chart
Mars is the part of the chart that answers one question:How do I go after what I want? It describes drive and desire — not events, and not outcomes.
What Taurus does to it
Taurus is a earth sign, so it moves on evidence and consistency. It is also fixed, which means it holds things. Put those together with Mars and you get acts deliberately — steady, sensory, loyal, applied specifically to drive and desire.
Taurus is ruled by Venus, so this placement tends to be coloured by love style as well.
The useful version
Placements are not verdicts. This one describes a default setting, not a limit — the things listed above are what you do when you are not thinking about it, which is exactly why noticing them is worth something.