Putting male and female hamster together without killing eachother

i have a male hamster and female and they are in two diff. cages, i really want to breed them but last time i put the female in the males cage and they fought really bad and made eachother bleed.. that was about 6 months ago, but is there any good advice on how i could get them together? i really dont want them to hurt eachother though. they are the same type of hamster i think the are Syrian hamsters. ones creme and white and the other is grey,white,and parts of yellow. i really want them to breed so if theres any good advice please help!

Male hamsters should be first bred at 10 to 14 weeks of age. Females can be bred at the age of 6 to 10 weeks. As the female comes into 'heat' she will begin assuming a breeding stance with her back swayed and body stretched out. When petted over her back, she will remain motionless and sway her back even further. A thin mucus will be noticed coming from her vulva on the next day of the 'heat' cycle, which indicates that estrus will occur two days later. For breeding, place the female into the male's cage about one hour before dark. Closely observe the pair for mating activity or fighting. Females can be very aggressive towards males and can cause serious injuries. At the first sign of aggression by the female, remove the male; then try again the next night. Also, remove the male shortly after a successful mating has taken place.

Pregnancy is of very short duration in hamsters; lasting only 15 to 16 days. Just before delivery, the expectant mother will become restless and may discharge a small amount of blood from her vulva. Do not handle or disturb her at this time. It is wise to clean her cage two weeks following breeding, so her cage is relatively clean when babies arrive. Litter size ranges from 5 to 10 pups; larger litters are not uncommon. The pups are born hairless with their eyes and ears closed. However, they do already have their front teeth, the incisors.