diff -urN -Xfreeciv/diff_ignore freeciv/data/default/units.ruleset freeciv-work/data/default/units.ruleset
--- freeciv/data/default/units.ruleset	Tue Jul 23 21:01:17 2002
+++ freeciv-work/data/default/units.ruleset	Mon Jul 29 18:43:22 2002
@@ -22,8 +22,8 @@
 options="1.9"
 
 [units_adjust]
-firepower_factor=1     ; Multiply firepower by this value. Set it
-                       ; to zero to disable firepower altogether.
+firepower_factor=1     ; Divide hitpoints by this value. It has to be 
+                       ; set higher than zero.
 
 ; Below: The individual units, one per section.
 ;
diff -urN -Xfreeciv/diff_ignore freeciv/server/ruleset.c freeciv-work/server/ruleset.c
--- freeciv/server/ruleset.c	Tue Jul 23 21:01:18 2002
+++ freeciv-work/server/ruleset.c	Mon Jul 29 20:54:49 2002
@@ -622,6 +622,12 @@
 
   game.firepower_factor =
     secfile_lookup_int_default(file, 1, "units_adjust.firepower_factor");
+  if (game.firepower_factor <= 0) {
+      freelog(LOG_FATAL, "In the [units_adjust] section of the %s file,\n"
+		      "firepower_factor has been set to %d but has to be "
+		      "higher than zero.", filename, game.firepower_factor);
+      exit(EXIT_FAILURE);
+  }
 
   sec = secfile_get_secnames_prefix(file, "unit_", &nval);