Why had many 18th-century sieges become predictable and ritualized?

By the mid-18th century, sieges had become highly predictable and ritualized because they were increasingly treated as a science rather than a haphazard art. The development of sophisticated, geometric fortifications—such as the trace italienne—meant that well-defended cities could no longer be easily taken by storm.1

Instead, the process became a methodical application of engineering and geometry. Military leaders, influenced by the systematic techniques of engineers like Sébastien Le Prestre de Vauban, relied on standardized procedures such as trench warfare, methodical bombardment, and mining to reduce a fortress. Because these operations followed established rules and principles, the outcome of a siege often became clear before a final, desperate assault was necessary, leading the defenders to surrender once the technical requirements for a successful defense had been exhausted. This shift reflected a broader trend in the early modern period where war was increasingly viewed as a profession governed by rules, scientific study, and intellectual labor rather than raw, unpredictable combat.12