For the Triple Alliance, they must inflict pain on the Victor Empire from the start, preventing it from dragging the war into a prolonged battle and thereby crushing the Triple Alliance with its formidable industrial strength.
To achieve this, the key is to destroy Victor's Royal Shipyard.
Keep in mind that nearly half of the warships in the Victor Empire's Navy come from this shipyard. Once it's destroyed, even with Victor's industrial capacity, it will be difficult to recover in a short period.
Without the logistic repair capabilities of the Royal Shipyard, the Imperial Navy will lose its ability for sustained combat. As long as the Triple Alliance fights steadily, they can defeat it!
Not to mention that the Royal Shipyard is currently manufacturing Flying Airships — such powerful weapons! It certainly cannot be allowed to continue existing!
