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We have observed the OH (1720 MHz) line in five galactic SNRs with the VLA tomeasure their magnetic field strengths using the Zeeman effect. We detected all12 of the bright ($S_{\nu} > 200$ mJy) OH (1720 MHz) masers previously detectedby Frail et al. (1996) and Green et al. (1997) and measured significantmagnetic fields (i.e. $ > 3\sigma$) in ten of them. Assuming that the``thermal'' Zeeman equation can be used to estimate $\mid\vec{B}\mid$ for OHmasers, our estimated fields range from 0.2 to 2 mG. These magnetic fieldstrengths are consistent with the hypothesis that ambient molecular cloudmagnetic fields are compressed via the SNR shock to the observed values.Magnetic fields of this magnitude exert a considerable influence on theproperties of the cloud with the magnetic pressures ($10^{-7} - 10^{-9}$ ergcm$^{-3}$) exceeding the pressure in the ISM or even the thermal pressure ofthe hot gas interior to the remnant. This study brings the number of galacticSNRs with OH (1720 MHz) Zeeman detections to ten.

OH Zeeman Magnetic Field Detections toward Five Supernova Remnants Using the VLA