Herring's artillery plan played a crucial role in the battles of Bardia and Tobruk during World War II, particularly in the context of the Western Desert Campaign. These battles were part of the larger effort by the Allied forces to push back Axis powers in North Africa.

1. Bardia (January 1941): The strategic significance of Herring's artillery plan at Bardia was primarily in its ability to support the infantry assault effectively. The plan involved a concentrated and coordinated artillery barrage that aimed to neutralize enemy defenses and create breaches in the fortified positions held by Italian forces. This artillery support was crucial in softening enemy positions, allowing Australian infantry to advance with reduced resistance. The success of the artillery plan at Bardia demonstrated the effectiveness of combined arms operations, where artillery, infantry, and other forces worked in concert to achieve a breakthrough.

2. Tobruk (April 1941): At Tobruk, Herring's artillery plan was significant in defending the besieged garrison against Axis attacks. The artillery was used not only for direct defense but also for counter-battery fire to suppress enemy artillery, which was crucial in maintaining the integrity of the defensive perimeter. The effective use of artillery at Tobruk helped the Allied forces hold the port city against repeated Axis assaults, contributing to the prolonged siege that tied down significant Axis resources and disrupted their plans in North Africa.

Overall, Herring's artillery plans at Bardia and Tobruk were strategically significant because they exemplified the importance of artillery in both offensive and defensive operations. The plans helped achieve tactical objectives, supported infantry movements, and played a key role in the broader strategic goals of the Allies in the North African campaign.