The best laid plans would have delivered Bourne only their second league win of the season after a period of domination at Milking Nook Drove.
But the challenge of playing into the wind during the second half and a failure to take chances left the hosts with bruised bodies and confidence.
For the first 20 minutes, Bourne and Sileby Town waged a war of attrition as each failed to edge the other.
Fly-half Ed Hounsell had an early chance of a penalty on 19 minutes, but the wind blew his kick off line.
Hounsell made no mistake two minutes later and Bourne were away when Neil Wood picked up a scrum ball five metres from the try line and forced his way over to make it 10-0 with Hounsell’s conversion.
Another Hounsell penalty in front of the posts should have given Bourne the platform for success.
But a try from Ashley Rideout, converted by Dan Riley, handed Sileby a passport right back into the match.
This brought a complete reversal of fortunes in the second half where the visitors went ahead on 48 minutes as Max Hegner’s converted try came from a kick downfield which put Bourne in difficulty.
A penalty from Riley was almost made irrelevant by a threatening burst down the wing by Ben Keast when he looked certain to score on the breakaway.
But after running into tackle, Bourne were left with the consolation of a late Wood try, again converted by Hounsell.
In the first half, we had most of the play and most of the possession, but just didn’t use it correctlyBourne joint coach Nigel Lindley
After the game, Bourne joint coach Nigel Lindley said: “We didn’t use the elements correctly in the first half and we didn’t make the most of playing with the wind behind us.
“Then we gave away two tries because of errors and didn’t really get ourselves going again until the last 20 minutes of the match.
“We are not getting front-foot ball at the moment and by the time we’ve got it, we can’t get clear space and time to assess our options.
“In the first half, we had most of the play and most of the possession, but just didn’t use it.”
Double try scorer Wood added: “We had our chances and if we’d had capitalised in the first half, with the wind in Sileby’s faces, then the intensity in the last 20 minutes of the second half would have seen us home.
“The potential is there, but losing hooker Harry Thornburn after ten minutes meant that we had to move our tight head prop and, with the wind against us as well, it made it hard for us to beat Sileby.”
Bourne: Wood, Thornburn, J Forbes, Douglas, Hiscocks, Hume, Rushton, R Forbes, Giullari, Hounsell, A Dixon, T Dixon, Crocker, Boddy, Whadcock, Faversham, Keast, Thomas, Langdon.