|This is the tower's menacing face...|
I have never thought of defending a tower against one or two attackers as a problem - I mean, isn't it pretty straightforward how to defend the tower? Well, after watching my teammate, Akali, fall to a Sion/Tristana siege, I decided that I might be able to give a few pointers.
1. WHEN YOUR TOWER IS UNDER ATTACK, YOUR BEST BET IS TO DESTROY THEIR MINIONS!
I think that this is actually the most vital point that anyone can make! When your tower is under attack, the enemy team has most likely pushed a wave of minions in to help them attack the tower (and to absorb the tower damage). If you can get rid of their minion-meat-shield, then you will send then running home with their tails in-between their legs! Most champions will think twice about taking tower damage while an enemy is nearby to magnify the damage (or worse, taunt them into attacking and then aggroing the tower).
2. WHEN YOUR TOWER IS UNDER ATTACK, YOU SHOULD KITE THE ATTACKERS!
An effective strategy in defending your tower is to have the attackers chase you while the tower attacks them. The best way to do this is to get the tower to attack them by using a taunt skill (like Shen or Rammus). If your champion does not have a taunt skill, then you can also try to get yourself hit by their passive skills (such as Kayle's splash damage or an enemy's Sunfire Cape). Once the tower starts shooting at the enemy champions, all you need to do is run away while they chase you!
I have seen some players kite Twitch's into their doom, due to Twitch's poison skill. I have seen players purposefully step on Teemo's mushrooms while Teemo was attacking a tower. Once you get turret fire to focus on the enemy champion, it really is just a matter of time before they fall!
3. WHEN YOUR TOWER IS UNDER ATTACK, YOU SHOULD BUY TIME FOR YOUR TEAMMATES TO REVIVE
Sometimes, you may not have enough firepower or even experience to successfully defend a tower. In those cases, what you want to do is just keep the enemy busy long enough so that your allies can revive.You can pelt them with Zilean's bombs (from a safe distance, of course), you can harass them with Ashe's volleys, or you can even stun them with Sion's stun gaze! Just do whatever you can go save that tower!
4. WHEN YOUR TOWER IS UNDER ATTACK, TRY TO DISTRACT THEM BY ATTACKING THEIR TOWERS, INSTEAD!
Sometimes, you may be too far away from your own tower to even attempt to save it. In this case, you can do something called a 'backdoor', which is an attack on an enemy tower or inhibitor without the aid of minions. If you have enough damage, the enemy will be forced to retreat from their own attack, or else potentially lose towers due to your massive damage! This works particularly well with late game DPS champions such as Shaco, Sivir, and Master Yi!
If the enemy does not retreat, at the very least, you will have traded your tower for their tower (which is an even trade, last time I checked!).
5. WHILE YOU ARE DEFENDING YOUR TOWER, YOU SHOULD NOT WALK AROUND IN CIRCLES DOING NOTHING!
Don't ever let the enemy get free hits on your tower! Nothing in life is free! (Not even love!). I have seen many towers fall due to teammates walking around in circles just behind a dying turret. It seems that they fear taking damage (or death) so much that they refuse to even cast one spell on the attacking team! If your tower is under attack, at least send some spells their way in order slow them down, or weaken them enough so that your teammates can finish them off!
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