During the war, Krupp proposed a modified version of the famous heavy howitzer'15 cm sFH 13', by extending the tube length from 14 to 17 calibres. This new version was named '15 cm lange sFH 13', and was manufactured to a total quantity of 1550 guns. Many of them survived the WW1 in numerous countries armies.

That modification improved the ballistic properties of the howitzer, for a small sacrifice to a heavier weight.

The tube and frame of this new howitzer were used to modernise a thousand of older '15 cm sFH 02', re-named '15 cm sFH 13/02'.

Main characteristics :

• Weight in firing position : 2250 kg
• Calibre : 149.7 mm
• Tube length : 17 calibres
• Projectile weight: 42 / 44 kg
• Initial velocity : 365 / 377 m/s
• Maximum range : 8500 / 8800 m
• Elevation range : -0 / +45 degrees
• Direction range : 5 degrees