Wrath of the Betrayer

Wrath of the Betrayer is chapter 4 of Terror of the Tides.

Greviously wounded, Maiev crawled back to her base camp to find her small force surrounded and outnumbered by the Naga, who were intent on destroying their most hated enemies. Knowing they could not possibly fight their way out, Maiev instead sent a Runner to get to the coast and then to the Night Elf forests, to summon reinforcements in the shape of Malfurion Stormrage and Tyrande Whisperwind, whilst she and her remaining warriors held out against the snake-people's assault. In the confusion of battle, however, Maiev was cut off from the rest of her forces and instead had to help the Runner sneak past Serena Scarscale's watery fortifications and aid her escape to the sea. Without Maiev's aid, the Naga were eventually able to break the Night Elf defences and force them to a final redoubt with no resources, where Maiev joined them for a last stand.

Aftermath
Illidan was successful in capturing the Eye of Sargeras and in defeating Maiev's Sentinels. However, they failed to destroy them entirely, and were unable to stop the Warden's Runner reaching Kalimdor and informing Malfurion of his brother's actions, a development which would ultimately foil Illidan's plans against the Lich King and destroy the Eye of Sargeras for good.

Secrets
If you blink to the Naga base on the right while playing as Maiev you'll find the in-game secret Keeper of the Storms Shrine.

If you blink to the Naga base on the top, you'll find a garden with the in-game secret Grank the Rat. He cannot be hit by any attack and is immune to spells - he can only be killed by clicking on him until he explodes. He drops a Talisman of Evasion (Warcraft III).

If you blink to the bottom left corner of the map you will find a Pandaren brewing area where a Level 1 Pandaren Brewmaster will give you a Slipper of Agility +3.

Near the mission start, there is an area with a massive destructible gate that Maiev can blink to. If she destroys the gate and enters the area behind it, an Infernal will fall from the sky. Pointing at the Infernal reveals that it belongs to the group Kil'Jaeden's Seekers. The Infernal drops Runed Bracers when killed.