Attacks are identified by order, not by name.

Eliminate one, in the Galleon, that is never used.

data/campaigns/Liberty/units/Villagers.cfg

@@ -54,7 +54,7 @@ ered across the Wesnoth countryside."
     advanceto=Outlaw_Peasant
     unit_description= _ "The scruffy-haired peasant youth are much like the young people living elsewhere in Wesnoth: reckless, cocky, and eager to explore."
     [attack]
-        name=club	# wmllint: no-icon
+        # Change first attack (club)
         damage=4	# Down from 5 in your basic Footpad
     [/attack]
     [female]

data/campaigns/Under_the_Burning_Suns/units/Confused_Ant.cfg

@@ -9,7 +9,7 @@
     movement=2		# Down from 4
     unit_description= _ "Giant Ants are common in almost any environment, from caverns deep under the earth to the tops of tall mountains. Though normally not hostile, they can bite at close range. When they don't have a Queen Ant to lead them, they can often become confused."
     [attack]
-        name=fangs	# wmllint: no-icon
+        # Change first attack (fangs)
         damage=5	# Down from 6
     [/attack]
 [/unit]

data/campaigns/Under_the_Burning_Suns/units/Dark_Assassin2.cfg

@@ -7,11 +7,11 @@
     hitpoints=60	# +8 from Dark Assassin1
     hide_help=true
     [attack]
-        name=scythe	# wmllint: no-icon
+        # Change first attack (scythe)
         damage=10	# +1 from Dark Assassin1
     [/attack]
     [attack]
-        name=darts	# wmllint: no-icon
+        # Change second attack (darts)
         damage=7	# +1 from Dark Assassin1
     [/attack]
 [/unit]

data/campaigns/Under_the_Burning_Suns/units/Dark_Assassin3.cfg

@@ -8,11 +8,11 @@
     hitpoints=68	# +16 from Dark Assassin1
     hide_help=true
     [attack]
-        name=scythe	# wmllint: no-icon
+        # Change first attack (scythe)
         damage=10	# +1 from Dark Assassin1
     [/attack]
     [attack]
-        name=darts	# wmllint: no-icon
+        # Change second attack (darts)
         damage=7	# +1 from Dark Assassin1
     [/attack]
 [/unit]

data/core/units/boats/Galleon.cfg

@@ -1,5 +1,6 @@
 #textdomain wesnoth-units
-#dummy unit which should never actually be used
+#dummy unit which should never actually be used;
+# exists only to create an entry in the help system.
 [unit]
     id=Galleon
     name= _ "Galleon"
@@ -18,11 +19,4 @@
     cost=10
     usage=null
     unit_description = _ "Galleons are blue-water ships built for trade and transport."
-    [attack]
-           description=_"dummy"
-        type=impact
-        range=melee
-        damage=1
-        number=1
-    [/attack]
 [/unit]