Halo Wars Legendary Gold Campaign - Mission 7 Scarab 

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Halo Wars Definitive Edition is a remaster of the Halo Wars 1 released in 2009 exclusively for the Xbox 360. Halo Wars Definitive Edition has been released in 20th of April 2017. Halo Wars is basically a prequel to the events in other Halo games, set up in the year 2531, 20 years before Halo Reach. Opposite to the other games in the series, this is a real time strategy where we take part in the war against Covenant as the Captain Cutter of Spirit of Fire or Sergeant Forge. In this series of playthroughs I try to finish the game on the Legendary difficulty, meanwhile trying to complete all the bonus objectives together with picking up the Skulls and Black Boxes around the map.
Mission with the Scarab can be either very hard or extremely easy. It all depends of your choices. If you move units carelessly, Scarab's search light will lock on your units frequently. Then, you will lose of units because of lack of micromanagement. Remember, if you keep losing units to it's beam, Scarab gets more and more aggressive. In the result, it destroys all the walls randomly and then your base will get destroyed. There are few ways to complete this mission, for example choosing Warthogs. But I prefer Scorpions because their movement is much less chaotic and they have a lot of armor + their firepower is higher, also Warthogs keep to miss their targets a lot. When Scarab is nearly destroyed, Covenants send a lot of units at your base so be prepared with MAC Blast or some units. This mission might be nervous for beginner, but it's possible to have zero casualties.