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Much the same as the offensive team, you and your teammates will need to make vehicles, and fast! However, since the defensive team’s Workshops are contained within the Keep, there is not such a high need for battling for control over the two contested Workshops. Also, it might take a few minutes for the attackers to start making vehicles, so this time should be used for maximum effect. There is no excuse for not being able to make vehicles once the onslaught has began.
Also, as mentioned above, the guns that are spread all over the keep are to be used. They only require one player for each gun, and they are capable of doing huge amounts of damage when used correctly. Their damage is AoE based, so an accurate shot on a moving vehicle is not needed, but will help.
If it looks like the attackers are breaking through the Keep walls a little too fast, then it would be recommended to go on the attack. Join forces with a few others and attack their towers. This will not only reduce the power buffs the attackers have placed upon them, but if all three are destroyed then 10 minutes will be knocked off the time of the battle. In a battle only lasting 30 minutes, being able to knock off a third of the allocated time will place a huge amount of pressure on the offensive team, and will often result in a win for the defense.
However, if the Keep is unfortunately breached, there is still hope. Much like Arathi Basin, players have to click and channel this for a few seconds in order to capture the Keep. This means that breaking their attempt with damage is vitally important. Consider fears and AoEs if this does happen.