They Laughed at His Tactics, Then Watched Their Entire Army Get Destroyed

It smashes through the first cannon crew, shattering limbs and ribs, bounces, destroys the second gun position, bounces again, demolishes the third crew 20 yd down the trench line, still bouncing. A single cannonball just cleared an entire defensive position without ever arcing above head height. The gunner watches in horror as dozens more balls come skipping down the length of every trench, every defensive line, every gun emplacement.

 Unstoppable physics turned into a weapon. France’s legendary military engineer, Sébastien Le Prestre de Vauban, has just revolutionized artillery warfare by hacking geometry itself. This is ricochet fire, and it will change siege combat forever. The Nine Years’ War erupted in 1688 when France’s Louis XIV launched a preemptive strike against the Holy Roman Empire.

 Louis was paranoid about his eastern frontier. The Habsburgs had just won crucial victories against the Ottoman Turks, freeing Emperor Leopold I to intervene in German affairs. French diplomatic leverage was collapsing. Traditional allies like Bavaria, Brandenburg, and Saxony had joined the Habsburg camp. Louis couldn’t push through his candidate as Elector of Cologne, threatening French control of strategically vital territory.

In September 1688, Louis demanded permanent recognition of his Reunions, territories France had seized over the previous decade. When the Empire refused, French armies crossed the Rhine, occupying the Palatinate and key Rhineland fortresses. Philipsburg was the prize. This fortress on the Rhine’s east bank had been French since 1644.

Vauban himself had fortified it years earlier, making it one of Europe’s strongest defensive positions. It was France’s critical bridgehead, allowing invasions into imperial territory, but the Empire had recaptured it in 1676 and held it with a 3,000-strong garrison. Reclaiming Philipsburg would close France’s defensive line, creating what contemporaries called an iron curtain protecting French territory.

 Louis assigned the siege to his son, the Dauphin Louis, supported by Marshal Jacques Henri de Duras and Lieutenant General Sébastien Le Prestre de Vauban, the 55-year-old military engineering genius who’d revolutionized siege warfare. The French siege force arrived late September 1688, 30 to 40,000 troops with 52 heavy guns and 24 mortars.

Inside Philipsburg, Imperial Field Marshal Maximilian von Starhemberg commanded approximately 2,000 defenders manning 124 artillery pieces. The defenders knew they faced France’s greatest siege engineer. Vauban had perfected the system of parallels, systematic trench networks allowing attackers to approach fortifications safely.

 French sappers began digging on September 27th, excavating zigzagging approach trenches that protected soldiers from defensive artillery fire while bringing French cannons progressively closer to the walls. But Vauban had been thinking about artillery physics. Traditional siege bombardment was brutally inefficient. Gunners fired cannonballs in high parabolic arcs designed to smash directly into fortification walls or drop into courtyards.

This required enormous amounts of gunpowder [music] to achieve the trajectory, and most of the kinetic energy was wasted. Balls either buried themselves uselessly in earthworks or shattered against stone without achieving maximum effect. Worse, high-arching fire couldn’t reach guns and troops sheltering behind parapets and in trenches.

Defenders could position artillery with impunity, knowing incoming fire would pass overhead. Vauban’s insight was geometric brilliance. What if you intentionally reduced the powder charge and aimed cannons at extremely shallow angles, just barely clearing the enemy parapet? The cannonball would enter the fortification at nearly ground level with tremendous residual velocity.

 Instead of stopping on first impact, it would skip, bounce, ricochet down the entire length of trenches and gun emplacements like a stone skimming water. Contemporary French military writers recommended elevations never exceeding 10° for fortification fire, sometimes as low as 3° for field operations. The technique required precise calculation.

 Too much powder, and the ball would arc over targets. Too little, and it wouldn’t clear the parapet. But executed correctly, a single ball could dismount multiple enemy cannons and devastate entire defensive lines. At Philipsburg, Vauban unleashed ricochet fire systematically. French gunners lowered powder charges, aimed their cannons flat, and [music] sent iron balls skipping through Imperial defensive positions.

 The psychological impact was devastating. Defenders watching from trenches saw cannonballs skip [music] toward them at chest or head height with nowhere to hide. The balls bounced unpredictably, clearing traverses designed [music] to block enfilade fire, reaching positions immune to traditional bombardment. Gun crews were shattered.

 Artillery was dismounted. Supply depots behind fortifications, never designed to withstand direct fire, were demolished by ricocheting balls that bounced deep into fortress interiors. The siege lasted 33 days. Imperial defenders fought courageously but faced impossible odds. Outnumbered 15 to 1, bombarded by revolutionary artillery techniques they couldn’t counter.

 On October 30th, von Starhemberg surrendered. French losses: 587 killed, 1,013 wounded. Imperial losses: 600 casualties plus 124 captured artillery pieces. The fortress that had taken the Empire a 3-month siege to capture in 1676 fell to Vauban in a month. Ricochet fire’s impact extended far beyond Philipsburg. Vauban perfected the technique at the Siege of Ath in 1697.

Throughout the 18th [music] century, field artillery relied principally on ricocheting round shot to sweep multiple lines of enemy troops. The technique remained standard until explosive shells, which burst on first ground contact, made solid shot obsolete. But Vauban’s geometric insight proved that sometimes innovation isn’t about more powerful weapons.

 It’s about using physics differently, turning wasted energy into devastating efficiency, making every shot count, not once, but five, six, seven times as it skipped down enemy lines like death skipping stones.