In May 2019 the Library of War was introduced in Guns of Glory. This is a new way to provide boosts to your troops.
The Hall of War has been extended with a new menu item, Library of War, available when Hall of War is lvl 22 or higher. When activating this item you will see an overview of War Strategies categorized in three sections, Infantry, Distance and Cavalry. Each War Strategy provides unique benefits to a troop type or a specific troop type and tier. By assiging War Handbooks to a War Strategy the benefits of the War Strategy become active.
For each of the troop types Infantry, Distance and Cavalry there is a War Strategy for each specific tier of troops and two War Strategies that apply to all troops of that type. These general two ones are available as soon as you have built the corresponding troop training building. The tier specific ones are available once you have upgraded the corresponding troop training building to the level that unlocks that tier (at lower levels it isn't useful anyway). Each War Strategy has 5 levels, each require one additional War Handbook.
War Strategies sometimes only apply if certain conditions are met, and for some one boost of your troops is sacrifized to add benefits to another. Make sure the ones you use complement your game play, I share some suggestions below.
You need a War Handbook to active a War Strategy or upgrade it to the next level. These War Handbooks require an amount of War Documents, standard resources and require time to learn. Each subsequent War Handbook you learn has increased requirements. In table below I show the requirements as far as I know them, please let me know in the comment section if you know requirements for more War Handbooks.
29 War Document
58 War Document
88 War Document
119 War Document
149 War Document
181 War Document
213 War Document
246 War Document
279 War Document
313 War Document
316 War Document
319 War Document
322 War Document
At this moment the only free way to get War Scrolls is as one of the rewards from the Musketeers Fort.
For 1000 gold you can reset your War Strategies. Resetting will remove all active boosts and return all War Documents to you. This is relatively cheap so you don't have to worry too much about making wrong decisions when assigning the War Documents.
If you use different troop tiers for either PvE or PvP combat you should for sure consider going for the War Strategies that provide boosts for all tiers of a troop type.
Since the next War Document is going to be more expensive irrespective of whether you assign it to the same or different War Strategies, there is no direct benefit of focusing on different War Strategies, better to determine which one is best for you, upgrade that one to level 5, and only afterwards focus on a new War Strategy.
From the War Strategies that provide boosts to all tiers I like Indestructible (Infantry, increase defense for all infantry troops), Cannons of Devestation (Distance, adds part of the Distance Defense to Distance Attack), Thunderous Charge (Cavalry, adds part of the Cavalry Defense to Cavalry Attack).
I don't like Sacrifice (Infantry), since it seems you need to have over 50% Infantry in your troop composition for it to be active, which I don't have; Iron Will (Distance), since it increases defense of Distance, which I don't consider a very important stat; Steel Resolve (Cavalry), since it increases the defense of Cavalry, not as little value as Distance Defense, but there are better alternatives.
The tier specific War Strategies for the higher tiers (9-12) all seem quite good, but I will focus on Cannons of Devestation, Thunderous Charge and Indestructible first. After that probably the War Strategies for the troops I use in my pvp March Preset in order of descending amount.
This should give a basic understanding of how the Library of War works and what War Strategies you can focus on. If you have any suggestions or questions please share.
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