Shrine Guardian vs. the Abyssal Kraken
The top caption says: 海上に蒼海魔蛸現る。神社機巧の神火弾、蒼き怪を撃退せり。
...which translates to: "Upon the sea, the Blue Ocean Demon Octopus appeared. The sacred-fire missiles of the Shrine Mechanism drove the blue monster back."
The bottom caption says: 怪獣大戦記録, which translates to: "Record of the great Kaiju War"
Samurai Castle vs. the Briny Beast
The left caption says: 或る日、海上に紅殻魔海老現る。
鉄城・白鷺丸の勇敢なる技師等、蒸気を轟かせ之を撃退せり。
...which translates to: " One day, the Crimson-Shelled Demon Shrimp appeared upon the sea. The brave engineers of the Iron Castle Shirasagi-maru, with thundering steam, drove it back."
The right caption says: 怪獣大戦記録, which translates to: "Record of the great Kaiju War"