When you steal the enemy's Oil you can delay their ship production and sometimes force them off the sea.
This strategy is more damaging on low resources is still something to watch out for on both medium and high resources
How to Steal Oil:
On low resources build Farm, Farm, Lumber Mill, Farm, build up enough Lumber for
a Shipyard and quickly build it with Peasants repairing it to build it faster. Build an
Oil Tanker then find the enemy Shipyard. After finding it place your Oil Tanker over the Oil
Spot, you might also Build an Oil Rig on their Oil Spot. On Low resources they will be forced
to build a Destroyer which will not be very good at destroying the Oil Rig. This should allow you to
use your Battleships to easily overcome them. The best counter to this strategy is to not
lose your Oil Spot in the first place. Rush to secure your Oil Spot by repairing your Shipyard to
complete it faster, build an Oil Tanker and quickly place it over your Oil Spot.
If your Oil is taken, on Medium you will be able to make one Battleship or more on High Resources to take care of
the Oil Tanker or Oil Rig. On Low resources the best thing you can do is quickly try to secure your other Oil Spot by
moving your Tanker that was unable to reach the first Oil Spot. If all of the Oil spots are stolen, attempt to use Catapults
to drive the enemy Oil Tanker off, or to hit the enemy Oil Rig. If that is not possible build up to Mages with Blizzard.
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Oil Tanker Finds enemy Shipyard.
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Oil Tanker is placed on Hold Position over enemy Oil.
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Enemy finds their Oil Stolen.
Once you have removed the enemy sea threat, siege their island. Send Battleships around the edges of their entire island looking
for buildings and units to attack. Sometimes by moving your Battleship in a diagonal line from the enemy you will be able to
take long shots which both of you might not be expecting to connect. Maneuver the Battleship into these positions if you're
unable to hit the enemy in the hopes that they will find the perfect spot to take the shot. It doesn't hurt to try.
When you leave Battleships along the enemy shore expect them to use Catapults and Blizzard/Death and Decay on them. Check back on
them every little while to make sure they are still there and immediately retreat when attacked. Refer to
Catapult vs Battleship control if you get into a Catapult fight. If you get attacked by
Blizzard's move your Battleships well out of range but still place them in a naval blockade around the island, especially
Heavy Firepower Support
Use Battleships or Juggernaughts as support for your invasions. Try to do your fighting by the shore, or lead the enemy to the shore.
Juggernaughts will shoot when the enemy comes within range, with the splash damage severely killing or destroying many
of them. Make some Archers or possibly a Catapult then use hit and run attacks trying to bait the enemy into
range so the Battleships can finish them. Run back to a Transport, get in, and move the Transport as the enemy runs to the shore.
Then come back once they back off or are destroyed. Repeat.
Hit and Run Strategies
If the enemy has some serious defenses, practice hit and run strategies. Full assaults usually will not
pay off so you have to soften them up before you go in.
If you have control of the sea and you really can't easily invade, make hit and run attacks from the shore. Unload
a group of Bloodlusted Ogres or Paladins, attack some buildings, then run back to the supporting fire of the Battleships
on the shore. Combine with Catapults for even better results. Using this method you can pick off enemy buildings working your
way closer and closer into their town. Often you can bait the enemy units within range of your Battleship fire which can
quickly slaughter large numbers of enemy units with splash damage.
If you are playing Humans and having problems with Death Knights get an Invisible Transport and fill it
with some Paladins with Exorcism researched. Make sure you know where the enemy's Death Knights are located using
Flying Machines or Holy Vision. Command the Paladins to exit the Transport, run in cast Exorcism then run back to
the Transport. Send the Transport back home as quickly as possible.
Use the hit and run attacks with Mages. Put them in a Transport,
have them hop out, cast a Blizzard, then quickly get back into the
Transport and run! You can also use Mages to do hit and run Polymorph attacks against enemy
Gryphons, Mages and Death Knights.
Catapults and Blizzards are the best defense against such an attack. Blizzard the ships and units camping by the shore.
On water maps Archers are generally only good for driving away Flying Machines and for
attacking enemy Dragons. Human Rangers fully upgraded can however be a good invasion force.
Get the 300 300 Axe/Arrow upgrade if you suspect the enemy may attack with Dragons.
Humans can sometimes use hit and run Archer attacks to clear an enemy island. Unload from a Transport, shoot at
enemy units or buildings then run back to the Transport if you get in trouble. Follow up with supportive Battleship fire
to finish off anything that comes near the shore.
Deadly Sea Sapper Strategy
Once you have the enemy off the sea or when you need to soften them up for invasion, use Demolition Squads or Goblin Sappers. Send a
Transport full of 2-4 at a time to blow up enemy Farms and important buildings. Don't be afraid to build 2-4 or more
Goblin Alchemist buildings to produce both Goblin Zeppelins and Goblin Sappers at the same time.
The Move In Invasion
Once you control the sea, send a Transport over with some Peasants. Build a Barracks right
on the enemy's shore. Try if possible to keep it hidden. Use your ships
to protect the Barracks. The Barracks has to be close enough to the
shore that the Battleships can attack anyone attacking the Barracks. After
the Barracks is completed, build some Towers. If the enemy has not reached the
Castle/Fortress stage yet, upgrade the Towers to Cannon Towers. If they have
a Castle, make a few Guard Towers because Cannon Towers can be attacked by Gryphons.
In this picture the beach head is covered by most anything except Mages, and Goblin Sappers. A few
more Guard Towers and some Axe Throwers should stop any Goblin Sappers that come in.
If the enemy is really sloppy about recon you might be able to build your whole
town on their island.
Send a Transport full of Peons in there to suicide vs their Death Knights or Mages. People laugh
when they see this but it is a valuable strategy. Try if possible
to sneak up on the Mages. By the time the enemy realizes what is going on,
their Mages are dead to the Peon Assassination Squad.
In the picture there, Both the sappers and Death Knight were killed by only 6 Peons.
That's quite a trade for some worthless wood choppers.