Index: data/default/units.ruleset
===================================================================
RCS file: /home/freeciv/CVS/freeciv/data/default/units.ruleset,v
retrieving revision 1.26
diff -u -r1.26 units.ruleset
--- data/default/units.ruleset	2001/07/15 11:11:56	1.26
+++ data/default/units.ruleset	2001/07/20 18:52:38
@@ -146,7 +146,7 @@
 attack        = 1
 defense       = 1
 hitpoints     = 10
-firepower     = 1
+firepower     = 0
 move_rate     = 1
 vision_range  = 1
 transport_cap = 0
Index: server/ruleset.c
===================================================================
RCS file: /home/freeciv/CVS/freeciv/server/ruleset.c,v
retrieving revision 1.73
diff -u -r1.73 ruleset.c
--- server/ruleset.c	2001/02/13 17:53:22	1.73
+++ server/ruleset.c	2001/07/20 18:52:38
@@ -649,6 +649,13 @@
     if( max_firepower && u->firepower > max_firepower ) {
       u->firepower = max_firepower;
     }
+    if (u->firepower <= 0) {
+      freelog(LOG_FATAL, "for unit_type \"%s\": firepower is %d but "
+	      "must be at least 1.\nSet the units attack strength to 0 "
+	      "if you want it to not have any attack ability. (%s)",
+	      u->name, u->firepower, filename);
+      exit(1);
+    }
     u->fuel = secfile_lookup_int(file,"%s.fuel", sec[i]);
 
     u->happy_cost  = secfile_lookup_int(file, "%s.uk_happy", sec[i]);