Here is the link to the only episode guide that gives detail of ground based weapons systems.
Link:
http://www.visi.com/~wildfoto/synopsis/420.html
See ACT TWO Second reference to Mars, 2nd and 3rd paragraphs. Reproduced here:
" Marcus and Lennier's White Star enters Mars' atmosphere creating a great disruption. It soars over the planet's surface taking out several laser sentries that would have hit Sheridan and Delenn's fleet otherwise.
In the bunker, they all hit the deck, and the White Star zooms in and destroys some fighters on the ground. Inside the bunker, Garibaldi spots a defense tower that has detected and targeted the White Star, and Number One orders that the bunkers guns destroy the tower, which they do."
That being said

ground based weapons systems may not have featured in B5 simply because the plot didn't require them to. We know that they had missiles

.
Please keep the weapon platforms just make them less damaging.
[ August 25, 2002, 13:12: Message edited by: Nomor ]