+++ unithand-new.c      Sat May  1 03:58:53 1999
@@ -949,8 +949,10 @@
     struct city *pcity_dest;
     
     pcity_dest=find_city_by_id(req->city_id);
-    
-    if(unit_flag(punit->type, F_CARAVAN) && pcity_dest &&
+
+    if(unit_flag(punit->type, F_CARAVAN) && pcity_dest && 
+       (unit->moves_left >= tile_move_cost(punit,punit->x,punit->y, 
+       pcity_dest->x, pcity_dest->y)) && 
        unit_can_help_build_wonder(punit, pcity_dest)) {
       pcity_dest->shield_stock+=50;
       if (build_points_left(pcity_dest) < 0) {