well, thats cheating, might as well not play at all.
The key to winning is to understand how important it is to keep gold in circulation. For example paying good amounts for attack flags even early is very much worth it because that money is not lost but gets to your troops, who will use it to buy better stuff, which makes the gold go back to you!
Also, you need to plan ahead and always try to be able to handle nasty surprises.
In the middle of the original campaign there are some missions where you sometimes get unlucky and get overwhelmed before your workers can build a military building, but thats just luck and a restart helps. It also only happens in the original campaign.