He said Sapper Smith was sorely missed and his sacrifice would not be forgotten.
After the hearing, Sapper Smith's mother Helen Smith said she believed his death had been preventable.
He voiced his concern after the repatriation of Sapper Richard Walker, which took place last month.
Maj Spratley, who joined as a Sapper in 2000, became an officer three years later.
Sapper Walker, 23, from Leeds, was from 28 Engineer Regiment attached to 21 Engineer Regiment.
Sapper Richard Walker, from Leeds, was killed on 7 January in the Nahr-e Saraj district of Helmand.
Sapper Mark Antony Smith, 26, from Swanley, died in the Sangin area of Helmand on 26 July 2010.
"For five mentally and physically exhausting hours, Sapper Garey purposefully placed himself in harm's way, " the citation reads.
BBC: UK forces' Operational Awards honour battlefield bravery
Sapper Mark Antony Smith, 26, died after the shell, meant to distract the Taliban, fell short of its target.
The second shell fell 866ft (264m) from its target and killed Sapper Smith, from Swanley, and injured two others.
Sapper Walker's girlfriend, Abbie Revill, 23, was supported by friends and family as she clutched their young daughter, Lilly-Faith.
The shell fell short of its target and hit an army compound, killing Sapper Mark Antony Smith, 26, from Swanley.
As Sapper Foster's coffin was carried in to the cathedral, Bette Midler's Wind Beneath my Wings was played over speakers.
Take Sapper Matthew Garey, from the Royal Engineers and already a seven-year veteran of the Army at the age of 24.
BBC: UK forces' Operational Awards honour battlefield bravery
In April, Sapper Smith spent a week at the Battle Back Centre in Lilleshall which is funded by the British Legion.
The shell that killed Sapper Smith fell 866ft (264m) from its target on 26 July 2010 in the Sangin area of Helmand.
Sapper Smith was treated at the city's Queen Elizabeth hospital for six weeks before being transferred to Headley Court rehabilitation centre in Surrey.
Sapper Darren Foster of 21 Engineer Regiment died in hospital on 13 August after being shot in the Sangin district of Helmand province.
In January, 23-year-old Sapper Richard Walker was shot dead by a member of the Afghan National Army as he undertook construction work in Helmand.
In the afternoon, a second shell landed 870ft (264m) short, landing on compound 22, killing Sapper Smith and injuring two others, the inquest heard.
And of course, we shouldn't forget Vladikavkaz Technology Center's Baspik , which makes high-tech night-vision equipment--just what every sapper team needs anywhere in the world.
Tributes also came from Sapper Walker's friends in 28 Engineer Regiment.
Sapper Richard Walker died in an insider attack by a suspected member of the Afghan National Army in the Nahr-e Saraj district of Helmand last week.
Sapper Smith served with 36 Engineer Regiment, based in Maidstone.
He said Sapper Smith was 866ft (264m) from the shell's target when he was hit, but safety guidelines recommended a distance of 1, 640ft (500m) from smoke shells to allow for error.
Three further attempts to clear and repair the route claimed four more casualties, so it was a "tense journey - returning to the scene of the crime, so to speak, " says Sapper Garey, from Tamworth.
BBC: UK forces' Operational Awards honour battlefield bravery
Sapper Clive Smith, 26, from Hednesford, Staffordshire, was injured when he stood on an Improvised Explosive Device (IED) while on duty with the 33 Engineer Regiment in the Nahr-e Saraj district of Helmand in 2010.
Captain Douglas Brain, who was with Sapper Smith at the time of the incident, paid tribute to "a man who truly lived life to the full, with an unrivalled wit and a wicked sense of humour".
While half the convoy escaped, Staff Sgt Cullingworth, who was married with two sons, and Sapper Allsopp were taken to a local Baath party headquarters and then to an Iraqi intelligence base, where they were shot dead.
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