The Ark of War (Crossover x Emperor male reader)

Devonport.

Guilliman: Which ones?

Y/n: I'm sending you the Krieg 13th Division: 160th artillery, 657th infantry, 435th Infantry, 189th armored cavalry, 40,000 men, 10,000 each regiment, in addition to the Krieg 908th Infantry, 10,000 men, and the 129th Krieg Armored regiment, yet another 10,000 men. From the Mordian Iron Guard I'm sending you Mordian Division 14: 222nd Mordian Infantry, 146th Mordian Armored, 675th Mordian infantry, 1009th Mordian artillery, about 40,000 men again. So in total about 100,000 men.

Guilliman: Wait, I recognize these regiments . . . The Bad Batch? and General Grievance? Isn't this a bit much?

Y/n: We are trying to ensure the lowest amount of casualties possible, and we have near unlimited manpower, unlike the other nation of the known world, so no. And like father and Horus always said, there's no kill like overkill. I'm also sending you the mission description, what I expect, and also some additional military assets with the main forces, such as two Custodes and some additional warships.

Guilliman: You are aware that Horus went traitor?

Y/n: The most aware. Anyways, Rendezvous and you get the rest. Y/n, out.

I received a notification on my data-slate that Y/n had sent the mission to me.

I looked at it and smirked. I finally can help with the war effort . . . though I do believe we are a bit . . . much.

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Location: Normandy, France.

Occupied by: Crimson Axis: Vichy Dominion (Mussolini France), and Iron-Blood (Nazi) fortifications and garrisons.

Mission: 

Primary: Assist Azur Lane in the liberation of Northern France.

Secondary: Smash through the enemy defenses and provide a safe landing zone for allied forces invading Normandy.

Tertiary: Neutralize all Naval artillery guns. Eliminate any Crimson Axis leadership present. 

Quaternary: Show the Imperium is not to be trifled with in any manner of warfare. This includes psychological.

Description of defenses (the Atlantic Wall) according to scouts and ONI Prowlers:

 The Atlantic wall is created of concrete and runs along the entire northern Iberian Peninsula. It contains thousands of machine gun nests, fortified bunkers, naval artillery casemates, anti-tank ditches, and is preceded by millions of mines, naval mines, anti-landing craft obstacles, and behind it lie AA defenses, more artillery and machine gun nests, bunkers, and anti-paratroop metal spikes referred to as "Rommel's Asparagus".

Notes:

This world's Mines and Tank ditches are obsolete compared to Imperial Tanks and tracked vehicles.

Prowler and frigate scans recommended to avoid and neutralize Naval mines. 

Minefield mines may be avoided with an auspex (Scanning device).

Anti-Landing craft obstacles inefficient and ineffective compared to the scale of operation. activated by pressure, recommend using Imperial Landing craft and landing parties first.

Enemy Munitions are insufficient for Imperial Shield technology. Macrocannon and lance Bombardment are Viable support  options. Bombard beforehand, unless you want extreme collateral damage of our own forces and that of allies. For extended CAS (close air support), Frigates and gunboats are advised, specifically IMC naval vessels due to their use of coilguns rather than macrocannons, to eliminate aforementioned collateral damage.